Windows: bunch of build fixes with CMake (#1585)

src/CMakeLists.txt

 target_link_libraries(
   espeak-ng-bin PRIVATE espeak-ng espeak-ng-config
 )
+if (MINGW)
+  target_link_options(espeak-ng-bin PRIVATE "-static-libstdc++" "-static")
+endif()
 if (MSVC)
   target_sources(espeak-ng-bin PRIVATE compat/getopt.c)
 endif()

src/libespeak-ng/CMakeLists.txt

 endif()
 target_link_libraries(espeak-ng PUBLIC espeak-include)
 
+if ((MINGW OR WIN32 OR MSVC) AND BUILD_SHARED_LIBS)
+  set_target_properties(espeak-ng PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY ..
+  )
+endif()
+
+if (MINGW)
+  target_link_options(espeak-ng PRIVATE "-static-libstdc++" "-static")
+endif()
+
 install(TARGETS espeak-ng LIBRARY)

tests/CMakeLists.txt

   target_link_libraries(test_${_test_name} PRIVATE
     $<TARGET_PROPERTY:espeak-ng,LINK_LIBRARIES>
   )
+  target_compile_definitions(test_${_test_name} PRIVATE LIBESPEAK_NG_EXPORT=1)
   target_include_directories(
     test_${_test_name} PRIVATE
     $<TARGET_PROPERTY:espeak-ng,SOURCE_DIR>
     $<TARGET_PROPERTY:espeak-ng,INTERFACE_INCLUDE_DIRECTORIES>
     $<TARGET_PROPERTY:espeak-ng-config,INTERFACE_INCLUDE_DIRECTORIES>
   )
+  if (MINGW)
+    target_link_options(test_${_test_name} PUBLIC "-static" "-static-libstdc++")
+  endif()
   add_dependencies(test_${_test_name} data)
   add_test(
     NAME ${_test_name}

tests/api.c

 	(void)argc; // unused parameter
 
 	char *progdir = strdup(argv[0]);
-	char *dir = strrchr(progdir, '/');
+	char *dir = strrchr(progdir, PATHSEP);
 	if (dir != NULL) *dir = 0;
 
 	test_espeak_terminate_without_initialize();