zlib: only enable NEON optimizations on eligible targets

Instead of inferring the availability of NEON support from the target
optimization flags, use a preprocessor test to decide whether to enable
ARMv8 NEON optimizations.

Fixes the following build error spotted by the mediatek/32 buildbot:

    [ 26%] Building C object CMakeFiles/zlib.dir/contrib/arm/inflate.o
    In file included from .../zlib-1.2.11/contrib/arm/chunkcopy.h:10:0,
                     from .../zlib-1.2.11/contrib/arm/inflate.c:87:
    .../arm_neon.h:31:2: error: #error You must enable NEON instructions (e.g. -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h
     #error You must enable NEON instructions (e.g. -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h
      ^
    In file included from .../zlib-1.2.11/contrib/arm/inflate.c:87:0:
    .../zlib-1.2.11/contrib/arm/chunkcopy.h:18:9: error: unknown type name 'uint8x16_t'
     typedef uint8x16_t chunkcopy_chunk_t;
             ^
    [...]
    CMakeFiles/zlib.dir/build.make:302: recipe for target 'CMakeFiles/zlib.dir/contrib/arm/inflate.o' failed

Fixes: 3acecba520 "package/libs/zlib: Add ARM and NEON optimizations"
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/libs/zlib/Makefile

@@ -60,10 +60,8 @@ ifeq ($(CONFIG_ZLIB_OPTIMIZE_SPEED),y)
 	TARGET_CFLAGS := $(filter-out -O%,$(TARGET_CFLAGS)) -O3
 endif
 
-ifneq ($(findstring neon,$(CONFIG_TARGET_OPTIMIZATION)),)
-	CMAKE_OPTIONS += \
-		-DARMv8=ON
-endif
+CMAKE_OPTIONS += \
+	-DARMv8=$$$$(echo -e '\#ifdef __ARM_NEON__\nON\n\#else\nOFF\n\#endif' | $$(TARGET_CC) $$(TARGET_CFLAGS) -x c -E - | grep -xE 'ON|OFF')
 
 define Build/InstallDev
 	mkdir -p $(1)/usr/include