libFLAC with Android NDK: use of undeclared identifier 'SIZE_MAX'

Hi flac-dev,

When we try to build libFLAC v1.3.1 using the Android NDK, we currently are
getting an error in a couple files:

../../third_party/flac/src/libFLAC/md5.c:498:25: error: use of undeclared
> identifier 'SIZE_MAX'
> if ((size_t)channels > SIZE_MAX / (size_t)bytes_per_sample)
>

I filed a bug for it on the sourceforge bug tracker:
https://sourceforge.net/p/flac/bugs/457/

This is fixed (in all NDK versions) by including limits.h.  I've attached a
simple patch that fixes the Android NDK build.

Please let me know if theres any other process involved in getting this
patch upstreamed.

Thanks,
~Steve

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diff --git a/src/libFLAC/md5.c b/src/libFLAC/md5.c
index e5adc3e..91d0aeb 100644
--- a/src/libFLAC/md5.c
+++ b/src/libFLAC/md5.c
@@ -2,6 +2,10 @@
 #  include <config.h>
 #endif
 
+#ifdef ANDROID
+#  include <limits.h>
+#endif
+
 #include <stdlib.h>		/* for malloc() */
 #include <string.h>		/* for memcpy() */
 
diff --git a/src/libFLAC/memory.c b/src/libFLAC/memory.c
index d22df70..8621e6d 100644
--- a/src/libFLAC/memory.c
+++ b/src/libFLAC/memory.c
@@ -34,6 +34,10 @@
 #  include <config.h>
 #endif
 
+#ifdef ANDROID
+#  include <limits.h>
+#endif
+
 #ifdef HAVE_STDINT_H
 #include <stdint.h>
 #endif