Use SDL string functions where possible

src/include/uae/string.h

@@ -4,6 +4,8 @@
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
+#include <SDL.h>
+
 #include "uae/types.h"
 #include <string.h>
 
@@ -18,42 +20,42 @@
 #ifdef _WIN32
 /* Using the real _tcs* functions */
 #else
-#define _istdigit isdigit
-#define _istspace isspace
+#define _istdigit SDL_isdigit
+#define _istspace SDL_isspace
 #define _istupper isupper
-#define _sntprintf snprintf
+#define _sntprintf SDL_snprintf
 #define _stprintf sprintf
-#define _strtoui64 strtoll
+#define _strtoui64 SDL_strtoll
 #define _tcscat strcat
-#define _tcschr strchr
-#define _tcscmp strcmp
+#define _tcschr SDL_strchr
+#define _tcscmp SDL_strcmp
 #define _tcscpy strcpy
 #define _tcscspn strcspn
-#define _tcsdup strdup
+#define _tcsdup SDL_strdup
 #define _tcsftime strftime
 #define _tcsftime strftime
 #define _tcsicmp stricmp
-#define _tcslen strlen
+#define _tcslen SDL_strlen
 #define _tcsncat strncat
-#define _tcsncmp strncmp
+#define _tcsncmp SDL_strncmp
 #define _tcsncpy strncpy
 #define _tcsnicmp SDL_strncasecmp
-#define _tcsrchr strrchr
+#define _tcsrchr SDL_strrchr
 #define _tcsspn strspn
-#define _tcsstr strstr
-#define _tcstod strtod
+#define _tcsstr SDL_strstr
+#define _tcstod SDL_strtod
 #define _tcstok strtok
-#define _tcstol strtol
-#define _tcstoul strtoul 
-#define _totlower tolower
-#define _totupper toupper
+#define _tcstol SDL_strtol
+#define _tcstoul SDL_strtoul 
+#define _totlower SDL_tolower
+#define _totupper SDL_toupper
 #define _tprintf printf
-#define _tstof atof
+#define _tstof SDL_atof
 #define _tstoi64 atoll
-#define _tstoi atoi
+#define _tstoi SDL_atoi
 #define _tstol atol
-#define _vsnprintf vsnprintf
-#define _vsntprintf vsnprintf
+#define _vsnprintf SDL_vsnprintf
+#define _vsntprintf SDL_vsnprintf
 #endif
 
 static inline size_t uae_tcslcpy(char *dst, const TCHAR *src, size_t size)