Update extras.

extras/dr_flac.h

 // FLAC audio decoder. Public domain. See "unlicense" statement at the end of this file.
-// dr_flac - v0.9.9 - 2018-08-05
+// dr_flac - v0.9.10 - 2018-08-07
 //
 // David Reid - mackron@gmail.com
 
@@ -157,16 +157,10 @@ extern "C" {
 #endif
 
 // Check if we can enable 64-bit optimizations.
-#if defined(_WIN64)
+#if defined(_WIN64) || defined(_LP64) || defined(__LP64__)
 #define DRFLAC_64BIT
 #endif
 
-#if defined(__GNUC__)
-#if defined(__x86_64__) || defined(__ppc64__) || defined(__aarch64__)
-#define DRFLAC_64BIT
-#endif
-#endif
-
 #ifdef DRFLAC_64BIT
 typedef drflac_uint64 drflac_cache_t;
 #else
@@ -5756,6 +5750,9 @@ const char* drflac_next_vorbis_comment(drflac_vorbis_comment_iterator* pIter, dr
 
 // REVISION HISTORY
 //
+// v0.9.10 - 2018-08-07
+//   - Improve 64-bit detection.
+//
 // v0.9.9 - 2018-08-05
 //   - Fix C++ build on older versions of GCC.
 //

extras/dr_mp3.h

 // MP3 audio decoder. Public domain. See "unlicense" statement at the end of this file.
-// dr_mp3 - v0.2.9 - 2018-08-05
+// dr_mp3 - v0.2.10 - 2018-08-07
 //
 // David Reid - mackron@gmail.com
 //
@@ -1987,7 +1987,7 @@ int drmp3dec_decode_frame(drmp3dec *dec, const unsigned char *mp3, int mp3_bytes
 #if defined(SIZE_MAX)
     #define DRMP3_SIZE_MAX  SIZE_MAX
 #else
-    #if defined(_WIN64) || defined(__ppc64__) || defined(__x86_64__) || defined(_M_X64) || defined(_M_ARM64) || defined(__aarch64__)
+    #if defined(_WIN64) || defined(_LP64) || defined(__LP64__)
         #define DRMP3_SIZE_MAX  ((drmp3_uint64)0xFFFFFFFFFFFFFFFF)
     #else
         #define DRMP3_SIZE_MAX  0xFFFFFFFF
@@ -2761,6 +2761,9 @@ void drmp3_free(void* p)
 // REVISION HISTORY
 // ===============
 //
+// v0.2.10 - 2018-08-07
+//   - Improve 64-bit detection.
+//
 // v0.2.9 - 2018-08-05
 //   - Fix C++ build on older versions of GCC.
 //   - Bring up to date with minimp3.

extras/dr_wav.h

 // WAV audio loader and writer. Public domain. See "unlicense" statement at the end of this file.
-// dr_wav - v0.8.3 - 2018-08-05
+// dr_wav - v0.8.4 - 2018-08-07
 //
 // David Reid - mackron@gmail.com
 
@@ -743,7 +743,7 @@ void drwav_free(void* pDataReturnedByOpenAndRead);
 #if defined(SIZE_MAX)
     #define DRWAV_SIZE_MAX  SIZE_MAX
 #else
-    #if defined(_WIN64) || defined(__ppc64__) || defined(__x86_64__) || defined(_M_X64) || defined(_M_ARM64) || defined(__aarch64__)
+    #if defined(_WIN64) || defined(_LP64) || defined(__LP64__)
         #define DRWAV_SIZE_MAX  ((drwav_uint64)0xFFFFFFFFFFFFFFFF)
     #else
         #define DRWAV_SIZE_MAX  0xFFFFFFFF
@@ -3581,6 +3581,9 @@ void drwav_free(void* pDataReturnedByOpenAndRead)
 
 // REVISION HISTORY
 //
+// v0.8.4 - 2018-08-07
+//   - Improve 64-bit detection.
+//
 // v0.8.3 - 2018-08-05
 //   - Fix C++ build on older versions of GCC.
 //