Remove the PLATFORM_RISCOS code.

This is from the old espeak RiscOS port that has been removed.

If/when the espeak-ng program is ported to RiscOS, this will be
done in a different, more maintainable way.

src/libespeak-ng/readclause.c

 	}
 
 	if ((tail[0] == 's') && (tail[1] == 't')) {
-#ifdef PLATFORM_RISCOS
-		*value_out = 100;
-#else
 		double x;
 		// convert from semitones to a  frequency percentage
 		x = pow((double)2.0, (double)((value*sign)/12)) * 100;
 		*value_out = (int)x;
-#endif
 		return 2; // percentage
 	}
 

src/libespeak-ng/speak_lib.c

 	// It seems that the wctype functions don't work until the locale has been set
 	// to something other than the default "C".  Then, not only Latin1 but also the
 	// other characters give the correct results with iswalpha() etc.
-#ifdef PLATFORM_RISCOS
-	setlocale(LC_CTYPE, "ISO8859-1");
-#else
 	if (setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
 		if (setlocale(LC_CTYPE, "UTF-8") == NULL)
 			if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL)
 				setlocale(LC_CTYPE, "");
 	}
-#endif
 
 	init_path(path);
 	if (options & espeakINITIALIZE_PATH_ONLY)

src/libespeak-ng/voices.c

 #ifdef PLATFORM_WINDOWS
 #include "windows.h"
 #else
-#ifdef PLATFORM_RISCOS
-#include "kernel.h"
-#else
 #include "dirent.h"
 #endif
-#endif
 
 #include "speak_lib.h"
 #include "phoneme.h"
 	speed.fast_settings[1] = 800;
 	speed.fast_settings[2] = 175;
 
-#ifdef PLATFORM_RISCOS
-	voice->roughness = 1;
-#else
 	voice->roughness = 2;
-#endif
 
 	InitBreath();
 	for (pk = 0; pk < N_PEAKS; pk++) {
 	int ftype;
 	char fname[sizeof(path_home)+100];
 
-#ifdef PLATFORM_RISCOS
-	int len;
-	int *type;
-	char *p;
-	_kernel_swi_regs regs;
-	_kernel_oserror *error;
-	char buf[80];
-	char directory2[sizeof(path_home)+100];
-
-	regs.r[0] = 10;
-	regs.r[1] = (int)path;
-	regs.r[2] = (int)buf;
-	regs.r[3] = 1;
-	regs.r[4] = 0;
-	regs.r[5] = sizeof(buf);
-	regs.r[6] = 0;
-
-	while (regs.r[3] > 0) {
-		error = _kernel_swi(0x0c+0x20000, &regs, &regs); // OS_GBPB 10, read directory entries
-		if ((error != NULL) || (regs.r[3] == 0))
-			break;
-		type = (int *)(&buf[16]);
-		len = strlen(&buf[20]);
-		sprintf(fname, "%s.%s", path, &buf[20]);
-
-		if (*type == 2) {
-			// a sub-directory
-			GetVoices(fname);
-		} else {
-			// a regular line, add it to the voices list
-			if ((f_voice = fopen(fname, "r")) == NULL)
-				continue;
-
-			// pass voice file name within the voices directory
-			voice_data = ReadVoiceFile(f_voice, fname+len_path_voices, &buf[20]);
-			fclose(f_voice);
-
-			if (voice_data != NULL)
-				voices_list[n_voices_list++] = voice_data;
-		}
-	}
-#else
 #ifdef PLATFORM_WINDOWS
 	WIN32_FIND_DATAA FindFileData;
 	HANDLE hFind = INVALID_HANDLE_VALUE;
 	}
 	closedir(dir);
 #endif
-#endif
 }
 
 espeak_ERROR SetVoiceByName(const char *name)
 {
 	char path_voices[sizeof(path_home)+12];
 
-#ifdef PLATFORM_RISCOS
-	if (n_voices_list == 0) {
-		sprintf(path_voices, "%s%cvoices", path_home, PATHSEP);
-		len_path_voices = strlen(path_voices)+1;
-		GetVoices(path_voices);
-		voices_list[n_voices_list] = NULL; // voices list terminator
-	}
-	return (const espeak_VOICE **)voices_list;
-#else
 	int ix;
 	int j;
 	espeak_VOICE *v;
 		voices[j] = NULL;
 	}
 	return (const espeak_VOICE **)voices;
-#endif
 }
 
 ESPEAK_API espeak_VOICE *espeak_GetCurrentVoice(void)

src/libespeak-ng/wavegen.c

 	}
 }
 
-#ifndef PLATFORM_RISCOS
 static double resonator(RESONATOR *r, double input)
 {
 	double x;
 
 	rp->a = 1.0 - rp->b - rp->c;
 }
-#endif
 
 void InitBreath(void)
 {
-#ifndef PLATFORM_RISCOS
 	int ix;
 
 	minus_pi_t = -PI / samplerate;
 
 	for (ix = 0; ix < N_PEAKS; ix++)
 		setresonator(&rbreath[ix], 2000, 200, 1);
-#endif
 }
 
 static void SetBreath()
 {
-#ifndef PLATFORM_RISCOS
 	int pk;
 
 	if (wvoice->breath[0] == 0)
 			setresonator(&rbreath[pk], peaks[pk].freq >> 16, wvoice->breathw[pk], 0);
 		}
 	}
-#endif
 }
 
 static int ApplyBreath(void)
 {
 	int value = 0;
-#ifndef PLATFORM_RISCOS
 	int noise;
 	int ix;
 	int amp;
 			value += (int)resonator(&rbreath[ix], noise) * amp;
 		}
 	}
-#endif
 	return value;
 }
 
 		if (voicing != 64)
 			total = (total >> 6) * voicing;
 
-#ifndef PLATFORM_RISCOS
 		if (wvoice->breath[0])
 			total +=  ApplyBreath();
-#endif
 
 		// mix with sampled wave if required
 		z2 = 0;

src/speak-ng.c

 	// It seems that the wctype functions don't work until the locale has been set
 	// to something other than the default "C".  Then, not only Latin1 but also the
 	// other characters give the correct results with iswalpha() etc.
-#ifdef PLATFORM_RISCOS
-	setlocale(LC_CTYPE, "ISO8859-1");
-#else
 	if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) {
 		if (setlocale(LC_CTYPE, "UTF-8") == NULL)
 			setlocale(LC_CTYPE, "");
 	}
-#endif
 
 	if ((result = LoadPhData(&srate)) != 1) {
 		if (result == -1) {