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fix compilation of libpng, and warning of jpeg

diff -r 4491ac456363 external/jpeg-9b/jmem-android.c
--- a/external/jpeg-9b/jmem-android.c	Sun Oct 22 02:05:28 2017 -0700
+++ b/external/jpeg-9b/jmem-android.c	Sun Oct 22 15:24:03 2017 +0200
@@ -18,6 +18,7 @@
 #include "jinclude.h"
 #include "jpeglib.h"
 #include "jmemsys.h"		/* import the system-dependent declarations */
+#include <unistd.h>         /* For unlink() and getpid() */
 
 #ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare malloc(),free() */
 extern void * malloc JPP((size_t size));
diff -r 4491ac456363 external/libpng-1.6.32/pnglibconf.h
--- a/external/libpng-1.6.32/pnglibconf.h	Sun Oct 22 02:05:28 2017 -0700
+++ b/external/libpng-1.6.32/pnglibconf.h	Sun Oct 22 15:24:03 2017 +0200
@@ -194,12 +194,18 @@
 #define PNG_GAMMA_THRESHOLD_FIXED 5000
 #define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE
 #define PNG_INFLATE_BUF_SIZE 1024
+#define PNG_LINKAGE_API extern
+#define PNG_LINKAGE_CALLBACK extern
+#define PNG_LINKAGE_DATA extern
+#define PNG_LINKAGE_FUNCTION extern
 #define PNG_MAX_GAMMA_8 11
 #define PNG_QUANTIZE_BLUE_BITS 5
 #define PNG_QUANTIZE_GREEN_BITS 5
 #define PNG_QUANTIZE_RED_BITS 5
 #define PNG_TEXT_Z_DEFAULT_COMPRESSION (-1)
 #define PNG_TEXT_Z_DEFAULT_STRATEGY 0
+#define PNG_USER_HEIGHT_MAX 1000000
+#define PNG_USER_WIDTH_MAX 1000000
 #define PNG_WEIGHT_SHIFT 8
 #define PNG_ZBUF_SIZE 8192
 #define PNG_Z_DEFAULT_COMPRESSION (-1)