code cleanup: move towlower2()

src/libespeak-ng/common.c

 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>
 #include <espeak-ng/encoding.h>
-
+#include <ucd/ucd.h>
 
 #include "common.h"
+#include "translate.h"
 
 #pragma GCC visibility push(default)
 
 	}
 	*c = c1;
 	return n_bytes+1;
-}
+}
+
+int towlower2(unsigned int c, Translator *translator)
+{
+	// check for non-standard upper to lower case conversions
+	if (c == 'I' && translator->langopts.dotless_i)
+		return 0x131; // I -> ı
+
+	return ucd_tolower(c);
+}

src/libespeak-ng/common.h

 #define ESPEAK_NG_COMMON_H
 
 #include "espeak-ng/espeak_ng.h"
+#include "translate.h"
 
 extern ESPEAK_NG_API int GetFileLength(const char *filename);
 extern ESPEAK_NG_API void strncpy0(char *to, const char *from, int size);
 
+int towlower2(unsigned int c, Translator *translator); // Supports Turkish I
+
 ESPEAK_NG_API int utf8_in(int *c, const char *buf);
 int utf8_in2(int *c, const char *buf, int backwards);
 int utf8_out(unsigned int c, char *buf);

src/libespeak-ng/compiledict.c

 #include "error.h"                // for create_file_error_context
 #include "mnemonics.h"               // for LookupMnemName, MNEM_TAB
 #include "phoneme.h"              // for PHONEME_TAB_LIST, phonSWITCH, phone...
-#include "readclause.h"           // for towlower2
 #include "speech.h"		// for path_home
 #include "synthesize.h"           // for Write4Bytes
 #include "translate.h"            // for isspace2, IsDigit09, utf8_in, utf8_out

src/libespeak-ng/numbers.c

 #include "common.h"
 #include "dictionary.h"  // for Lookup, TranslateRules, EncodePhonemes, Look...
 #include "phoneme.h"     // for phonSWITCH, PHONEME_TAB, phonEND_WORD, phonP...
-#include "readclause.h"  // for WordToString2, towlower2
+#include "readclause.h"  // for WordToString2
 #include "synthdata.h"   // for SelectPhonemeTable
 #include "synthesize.h"  // for phoneme_tab
 #include "translate.h"   // for Translator, LANGUAGE_OPTIONS, IsDigit09, WOR...

src/libespeak-ng/readclause.c

 	return (*str == 0 && memcmp(str, str+1, size-1) == 0);
 }
 
-int towlower2(unsigned int c, Translator *translator)
-{
-	// check for non-standard upper to lower case conversions
-	if (c == 'I' && translator->langopts.dotless_i)
-		return 0x131; // I -> ı
-
-	return ucd_tolower(c);
-}
-
 static int IsRomanU(unsigned int c)
 {
 	if ((c == 'I') || (c == 'V') || (c == 'X') || (c == 'L'))

src/libespeak-ng/readclause.h

 int is_str_totally_null(const char* str, int size);
 
 int clause_type_from_codepoint(uint32_t c);
-int towlower2(unsigned int c, Translator *translator); // Supports Turkish I
 int Eof(void);
 const char *WordToString2(unsigned int word);
 int Read4Bytes(FILE *f);