otautil: Clean up obsolete includes.

external/zlib and external/safe-iop/include were used by Zip.c, which
became obsolete after [1].

Removing
 - <assert.h>: we no longer call assert(3);
 - <limits.h>: we no longer use PATH_MAX;
 - <stdio.h>: we don't need FILE anymore;
 - <stdlib.h>: no more malloc(3)/calloc(3);
 - <unistd.h>: was once needed for lseek(2);
 - <string.h>: no more memset(3).

Adding
 - <stdint.h> for SIZE_MAX.

[1] commit 8cf5c8f60f: "Replace minzip
with libziparchive".

Test: `mmma bootable/recovery`
Change-Id: I349e909ba83d0f6ade5f92856ce3934f29fdca6c

otautil/Android.mk

@@ -20,16 +20,10 @@ LOCAL_SRC_FILES := \
     DirUtil.cpp \
     ZipUtil.cpp
 
-LOCAL_C_INCLUDES := \
-    external/zlib \
-    external/safe-iop/include
-
 LOCAL_STATIC_LIBRARIES := libselinux libbase
 
 LOCAL_MODULE := libotautil
 
-LOCAL_CLANG := true
-
 LOCAL_CFLAGS += -Werror -Wall
 
 include $(BUILD_STATIC_LIBRARY)

otautil/SysUtil.cpp

@@ -16,17 +16,12 @@
 
 #include "SysUtil.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <stdint.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <unistd.h>
 
 #include <algorithm>
 #include <string>