Make utf-8 source strings unlimited

src/win32/utf-conv.h

@@ -21,12 +21,12 @@ int git__utf8_to_16(wchar_t * dest, size_t dest_size, const char *src);
 // dest_size is the size of dest in char's
 int git__utf16_to_8(char *dest, size_t dest_size, const wchar_t *src);
 
-GIT_INLINE(int) git__win32_path_utf8_to_16(git_win32_path_utf16 dest, const git_win32_path_utf8 src)
+GIT_INLINE(int) git__win32_path_utf8_to_16(git_win32_path_utf16 dest, const char *src)
 {
 	return git__utf8_to_16(dest, GIT_WIN_PATH_UTF16, src);
 }
 
-GIT_INLINE(int) git__win32_path_utf16_to_8(git_win32_path_utf8 dest, const git_win32_path_utf16 src)
+GIT_INLINE(int) git__win32_path_utf16_to_8(git_win32_path_utf8 dest, const wchar_t *src)
 {
 	return git__utf16_to_8(dest, GIT_WIN_PATH_UTF8, src);
 }