Revert "Add signed integer overflow checking to zlib"

The build is broken.

This reverts commit 4018ebf35d1ab1cd6b1340f44df0a1095cb5d10d.
diff --git a/Android.mk b/Android.mk
index 532c86c..3780c89 100644
--- a/Android.mk
+++ b/Android.mk
@@ -4,7 +4,6 @@
 # measurements show that the ARM version of ZLib is about x1.17 faster
 # than the thumb one...
 LOCAL_ARM_MODE := arm
-LOCAL_CLANG := true
 
 zlib_files := \
 	src/adler32.c \
@@ -26,7 +25,6 @@
 LOCAL_MODULE := libz
 LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
-LOCAL_CFLAGS += -ftrapv
 LOCAL_SRC_FILES := $(zlib_files)
 ifeq ($(TARGET_ARCH),arm)
   LOCAL_SDK_VERSION := 9
@@ -35,12 +33,10 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_CLANG := true
 LOCAL_ARM_MODE := arm
 LOCAL_MODULE := libz
 LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
-LOCAL_CFLAGS += -ftrapv
 LOCAL_SRC_FILES := $(zlib_files)
 ifeq ($(TARGET_ARCH),arm)
   LOCAL_SDK_VERSION := 9
@@ -49,24 +45,20 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_CLANG := true
 LOCAL_ARM_MODE := arm
 LOCAL_MODULE := libz
 LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
-LOCAL_CFLAGS += -ftrapv
 LOCAL_SRC_FILES := $(zlib_files)
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 
 include $(CLEAR_VARS)
 
-LOCAL_CLANG := true
 LOCAL_ARM_MODE := arm
 LOCAL_MODULE := libz-host
 LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS += -O3 -DUSE_MMAP
-LOCAL_CFLAGS += -ftrapv
 LOCAL_SRC_FILES := $(zlib_files)
 include $(BUILD_HOST_SHARED_LIBRARY)
 
@@ -80,19 +72,15 @@
 # later, please see if you can get a bit further in removing libunz...
 
 include $(CLEAR_VARS)
-LOCAL_CLANG := true
 LOCAL_SRC_FILES := $(zlib_files)
 LOCAL_MODULE:= libunz
 LOCAL_ARM_MODE := arm
-LOCAL_CFLAGS += -ftrapv
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
-LOCAL_CLANG := true
 LOCAL_SRC_FILES := $(zlib_files)
 LOCAL_MODULE:= libunz
 LOCAL_ARM_MODE := arm
-LOCAL_CFLAGS += -ftrapv
 ifeq ($(TARGET_ARCH),arm)
   LOCAL_SDK_VERSION := 9
 endif
@@ -100,7 +88,6 @@
 
 include $(CLEAR_VARS)
 
-LOCAL_CLANG := true
 LOCAL_SRC_FILES:=        \
 	src/test/minigzip.c
 
@@ -108,18 +95,15 @@
 
 LOCAL_SHARED_LIBRARIES := libz
 
-LOCAL_CFLAGS += -ftrapv
 include $(BUILD_EXECUTABLE)
 
 include $(CLEAR_VARS)
 
-LOCAL_CLANG := true
 LOCAL_SRC_FILES:=        \
 	src/test/minigzip.c
 
 LOCAL_MODULE:= minigzip
 
-LOCAL_CFLAGS += -ftrapv
 LOCAL_STATIC_LIBRARIES := libz
 
 include $(BUILD_HOST_EXECUTABLE)