cmake: don't use target_compile_features when the CMake thinks the compiler does not support it

This happens when using an older CMake with a new LLVM toolchain (e.g. Android ndk)

CMakeLists.txt

@@ -372,14 +372,22 @@ if(SDL_SHARED)
   add_library(SDL3-shared SHARED)
   add_library(SDL3::SDL3-shared ALIAS SDL3-shared)
   SDL_AddCommonCompilerFlags(SDL3-shared)
-  target_compile_features(SDL3-shared PRIVATE c_std_99)
+  if ("c_std_99" IN_LIST CMAKE_C_COMPILE_FEATURES)
+    target_compile_features(SDL3-shared PRIVATE c_std_99)
+  else()
+    message(WARNING "target_compile_features does not know c_std_99 for C compiler")
+  endif()
 endif()
 
 if(SDL_STATIC)
   add_library(SDL3-static STATIC)
   add_library(SDL3::SDL3-static ALIAS SDL3-static)
   SDL_AddCommonCompilerFlags(SDL3-static)
-  target_compile_features(SDL3-static PRIVATE c_std_99)
+  if ("c_std_99" IN_LIST CMAKE_C_COMPILE_FEATURES)
+    target_compile_features(SDL3-static PRIVATE c_std_99)
+  else()
+    message(WARNING "target_compile_features does not know c_std_99 for C compiler")
+  endif()
 endif()
 
 if(SDL_TEST_LIBRARY)