public: fix build on Windows

stristr doesn't exist actually

public/crtlib.c

@@ -318,7 +318,7 @@ const char* Q_timestamp( int format )
 	return timestamp;
 }
 
-#if !HAVE_STRCASESTR && !HAVE_STRISTR
+#if !HAVE_STRCASESTR
 char *Q_stristr( const char *string, const char *string2 )
 {
 	int	c;

public/crtlib.h

@@ -258,21 +258,16 @@ int Q_strnicmp( const char *s1, const char *s2, size_t n );
 #endif
 
 
-#if HAVE_STRISTR || HAVE_STRCASESTR
+#if HAVE_STRCASESTR
 static inline char *Q_stristr( const char *s1, const char *s2 )
 {
 	if( likely( s1 && s2 ))
-#if HAVE_STRISTR
-		return (char *)stristr( s1, s2 );
-#elif HAVE_STRCASESTR
 		return (char *)strcasestr( s1, s2 );
-#endif
-
 	return NULL;
 }
-#else // !HAVE_STRISTR && !HAVE_STRCASESTR
+#else // !HAVE_STRCASESTR
 char *Q_stristr( const char *s1, const char *s2 );
-#endif // !HAVE_STRISTR && !HAVE_STRCASESTR
+#endif // !HAVE_STRCASESTR
 
 #if HAVE_STRCHRNUL
 #define Q_strchrnul strchrnul

public/wscript

@@ -86,7 +86,6 @@ def configure(conf):
 	if conf.env.DEST_OS == 'win32':
 		conf.export_define('HAVE_STRNICMP')
 		conf.export_define('HAVE_STRICMP')
-		conf.export_define('HAVE_STRISTR')
 	else:
 		# TODO: multicheck for speed
 		def check_libc_extension(frag, msg, define):