Update dr_libs.

extras/dr_flac.h

 /*
 FLAC audio decoder. Choice of public domain or MIT-0. See license statements at the end of this file.
-dr_flac - v0.12.29 - 2021-04-02
+dr_flac - v0.12.31 - 2021-08-16
 
 David Reid - mackron@gmail.com
 
@@ -232,7 +232,7 @@ extern "C" {
 
 #define DRFLAC_VERSION_MAJOR     0
 #define DRFLAC_VERSION_MINOR     12
-#define DRFLAC_VERSION_REVISION  29
+#define DRFLAC_VERSION_REVISION  31
 #define DRFLAC_VERSION_STRING    DRFLAC_XSTRINGIFY(DRFLAC_VERSION_MAJOR) "." DRFLAC_XSTRINGIFY(DRFLAC_VERSION_MINOR) "." DRFLAC_XSTRINGIFY(DRFLAC_VERSION_REVISION)
 
 #include <stddef.h> /* For size_t. */
@@ -261,7 +261,7 @@ typedef unsigned int            drflac_uint32;
         #pragma GCC diagnostic pop
     #endif
 #endif
-#if defined(__LP64__) || defined(_WIN64) || (defined(__x86_64__) && !defined(__ILP32__)) || defined(_M_X64) || defined(__ia64) || defined (_M_IA64) || defined(__aarch64__) || defined(__powerpc64__)
+#if defined(__LP64__) || defined(_WIN64) || (defined(__x86_64__) && !defined(__ILP32__)) || defined(_M_X64) || defined(__ia64) || defined (_M_IA64) || defined(__aarch64__) || defined(_M_ARM64) || defined(__powerpc64__)
     typedef drflac_uint64       drflac_uintptr;
 #else
     typedef drflac_uint32       drflac_uintptr;
@@ -11516,7 +11516,7 @@ static type* drflac__full_read_and_close_ ## extension (drflac* pFlac, unsigned
         DRFLAC_ZERO_MEMORY(pSampleData + (totalPCMFrameCount*pFlac->channels), (size_t)(sampleDataBufferSize - totalPCMFrameCount*pFlac->channels*sizeof(type)));   \
     } else {                                                                                                                                                        \
         drflac_uint64 dataSize = totalPCMFrameCount*pFlac->channels*sizeof(type);                                                                                   \
-        if (dataSize > DRFLAC_SIZE_MAX) {                                                                                                                           \
+        if (dataSize > (drflac_uint64)DRFLAC_SIZE_MAX) {                                                                                                            \
             goto on_error;  /* The decoded data is too big. */                                                                                                      \
         }                                                                                                                                                           \
                                                                                                                                                                     \
@@ -11851,6 +11851,12 @@ DRFLAC_API drflac_bool32 drflac_next_cuesheet_track(drflac_cuesheet_track_iterat
 /*
 REVISION HISTORY
 ================
+v0.12.31 - 2021-08-16
+  - Silence some warnings.
+
+v0.12.30 - 2021-07-31
+  - Fix platform detection for ARM64.
+
 v0.12.29 - 2021-04-02
   - Fix a bug where the running PCM frame index is set to an invalid value when over-seeking.
   - Fix a decoding error due to an incorrect validation check.