php: disable valgrind

Introduced in PHP7.2, if a host has valgrind headers installed, PHP will detect
them and set HAVE_VALGRIND to 1.
Disable this entry after configuring.

fixes:
http://autobuild.buildroot.net/results/d59/d59b5961890aeddcd6d59ed52243be6554d1fe21

Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/php/php.mk

@@ -232,6 +232,11 @@ define PHP_DISABLE_PCRE_JIT
 	$(SED) '/^#define SUPPORT_JIT/d' $(@D)/ext/pcre/pcrelib/config.h
 endef
 
+define PHP_DISABLE_VALGRIND
+	$(SED) '/^#define HAVE_VALGRIND/d' $(@D)/main/php_config.h
+endef
+PHP_POST_CONFIGURE_HOOKS += PHP_DISABLE_VALGRIND
+
 ### Use external PCRE if it's available
 ifeq ($(BR2_PACKAGE_PCRE),y)
 PHP_CONF_OPTS += --with-pcre-regex=$(STAGING_DIR)/usr