[Nokia N-Gage] Remove redundant guard after adding minimal stdbool.h to the toolchain

Author: mupfdev

include/SDL3/SDL_stdinc.h

@@ -64,7 +64,7 @@
 #define SDL_INCLUDE_STDBOOL_H
 #endif
 #endif
-#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && !defined SDL_PLATFORM_NGAGE) || \
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
     (defined(_MSC_VER) && (_MSC_VER >= 1910 /* Visual Studio 2017 */)) || \
     defined(SDL_INCLUDE_STDBOOL_H)
 #include <stdbool.h>