Fix potential warnings when compiling with GCC.

miniaudio.h

@@ -571,12 +571,21 @@ typedef ma_uint16 wchar_t;
 
 #ifdef _MSC_VER
     #define MA_INLINE __forceinline
-#else
-#ifdef __GNUC__
+#elif defined(__GNUC__)
+    /*
+    I've had a bug report where GCC is emitting warnings about functions possibly not being inlineable. This warning happens when
+    the __attribute__((always_inline)) attribute is defined without an "inline" statement. I think therefore there must be some
+    case where "__inline__" is not always defined, thus the compiler emitting these warnings. When using -std=c89 or -ansi on the
+    command line, we cannot use the "inline" keyword and instead need to use "__inline__". In an attempt to work around this issue
+    I am using "__inline__" only when we're compiling in strict ANSI mode.
+    */
+    #if defined(__STRICT_ANSI__)
         #define MA_INLINE __inline__ __attribute__((always_inline))
     #else
-#define MA_INLINE
+        #define MA_INLINE inline __attribute__((always_inline))
     #endif
+#else
+    #define MA_INLINE
 #endif
 
 #if defined(_MSC_VER)