Work around i386 ASAN fseek bug

For some reason, i386 ASAN's fseek does not have large file
support, and off_t is actually a 32-bit int

Author: ktmf01

src/flac/encode.c

@@ -2892,6 +2892,13 @@ FLAC__bool fskip_ahead(FILE *f, FLAC__uint64 offset)
 	static uint8_t dump[8192];
 	struct flac_stat_s stb;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+#ifdef __i386__
+/* Work around i386 ASAN bug */
+	if(offset > (FLAC__uint64)(INT32_MAX)) return false;
+#endif
+#endif
+
 	if(flac_fstat(fileno(f), &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFREG)
 	{
 		if(fseeko(f, offset, SEEK_CUR) == 0)