android,configure,meson: define HAVE_ZLIB

The next change wants to use some optional zlib functionality, however
not all platforms currently use zlib. Based on earlier Jordan Justen's
patches and their review feedback.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

Android.common.mk

@@ -70,6 +70,7 @@ LOCAL_CFLAGS += \
 	-DHAVE_DLADDR \
 	-DHAVE_DL_ITERATE_PHDR \
 	-DHAVE_LINUX_FUTEX_H \
+	-DHAVE_ZLIB \
 	-DMAJOR_IN_SYSMACROS \
 	-fvisibility=hidden \
 	-Wno-sign-compare

configure.ac

@@ -906,6 +906,7 @@ AC_CHECK_FUNC([posix_memalign], [DEFINES="$DEFINES -DHAVE_POSIX_MEMALIGN"])
 
 dnl Check for zlib
 PKG_CHECK_MODULES([ZLIB], [zlib >= $ZLIB_REQUIRED])
+DEFINES="$DEFINES -DHAVE_ZLIB"
 
 dnl Check for pthreads
 AX_PTHREAD

meson.build

@@ -943,6 +943,7 @@ endif
 
 # TODO: some of these may be conditional
 dep_zlib = dependency('zlib', version : '>= 1.2.3')
+pre_args += '-DHAVE_ZLIB'
 dep_thread = dependency('threads')
 if dep_thread.found() and host_machine.system() != 'windows'
   pre_args += '-DHAVE_PTHREAD'