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Fix compilation with GCC <= 4.7.3

Thanks @ccawley2011 and @lordmulder for the solution in FAAD2, from which
I have taken this, and @zvezdochiot for requesting this for FAAC.

Fixes #26

--- a/frontend/mp4write.c

+++ b/frontend/mp4write.c

@@ -54,9 +54,14 @@

 static inline uint32_t be32(uint32_t u32)

 {

 #ifndef WORDS_BIGENDIAN

-    //return __bswap_32(u32);

+#if defined (__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))

     return __builtin_bswap32(u32);

+#elif defined (_MSC_VER)

+    return _byteswap_ulong(u32);

 #else

+    return (u32 << 24) | ((u32 << 8) & 0xFF0000) | ((u32 >> 8) & 0xFF00) | (u32 >> 24);

+#endif

+#else

     return u32;

 #endif

 }

@@ -64,8 +69,13 @@

 static inline uint16_t be16(uint16_t u16)

 {

 #ifndef WORDS_BIGENDIAN

-    //return __bswap_16(u16);

+#if defined (__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)))

     return __builtin_bswap16(u16);

+#elif defined (_MSC_VER)

+    return _byteswap_ushort(u16);

+#else

+    return (u16 << 8) | (u16 >> 8);

+#endif

 #else

     return u16;

 #endif

--- a/project/msvc/unistd.h

+++ b/project/msvc/unistd.h

@@ -5,6 +5,3 @@

 #define W_OK    2

 #define access _access

-

-#define __builtin_bswap32 _byteswap_ulong

-#define __builtin_bswap16 _byteswap_ushort