Work around https://github.com/android-ndk/ndk/issues/201.

diff -u -r ../php-7.1.6/Makefile.global ./Makefile.global
--- ../php-7.1.6/Makefile.global	2017-06-07 10:09:38.000000000 +0200
+++ ./Makefile.global	2017-06-14 23:22:21.258154325 +0200
@@ -16,7 +16,7 @@
 build-binaries: $(PHP_BINARIES)
 
 libphp$(PHP_MAJOR_VERSION).la: $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS)
-	$(LIBTOOL) --mode=link $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -rpath $(phptempdir) $(EXTRA_LDFLAGS) $(LDFLAGS) $(PHP_RPATHS) $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS) $(EXTRA_LIBS) $(ZEND_EXTRA_LIBS) -o $@
+	$(LIBTOOL) --mode=link $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -rpath $(phptempdir) $(EXTRA_LDFLAGS) $(LDFLAGS) $(PHP_RPATHS) $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS) $(EXTRA_LIBS) -lapr-1 -laprutil-1 $(ZEND_EXTRA_LIBS) -o $@
 	-@$(LIBTOOL) --silent --mode=install cp $@ $(phptempdir)/$@ >/dev/null 2>&1
 
 libs/libphp$(PHP_MAJOR_VERSION).bundle: $(PHP_GLOBAL_OBJS) $(PHP_SAPI_OBJS)