win32: use __inline__ instead of __forceinline__ on MinGW

Author: illwieckz

src/include/nacl_compiler_annotations.h

@@ -10,7 +10,7 @@
 #include "native_client/src/include/build_config.h"
 
 /* MSVC supports "inline" only in C++ */
-#if NACL_WINDOWS
+#if NACL_WINDOWS && defined(_MSC_VER)
 # define INLINE __forceinline
 #else
 # define INLINE __inline__

src/trusted/validator_ragel/bitmap.h

@@ -15,7 +15,7 @@
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/include/portability.h"
 
-#if NACL_WINDOWS
+#if NACL_WINDOWS && defined(_MSC_VER)
 # define FORCEINLINE __forceinline
 #else
 # define FORCEINLINE __inline __attribute__ ((always_inline))

src/trusted/validator_ragel/decoding.h

@@ -19,7 +19,7 @@
 #include "native_client/src/include/build_config.h"
 #include "native_client/src/trusted/validator_ragel/decoder.h"
 
-#if NACL_WINDOWS
+#if NACL_WINDOWS && !defined(__GNUC__)
 # define FORCEINLINE __forceinline
 #else
 # define FORCEINLINE __inline __attribute__ ((always_inline))