benchmarks/vkoverhead: mark BROKEN on armv7

../src/vkoverhead.c:859:18: error: incompatible pointer to integer conversion initializing 'VkPipeline' (aka 'unsigned long long') with an expression of type 'void *' [-Werror,-Wint-conversion]
      VkPipeline pipeline = he->data;
                 ^          ~~~~~~~~
../src/vkoverhead.c:3084:63: error: incompatible integer to pointer conversion passing 'VkPipeline' (aka 'unsigned long long') to parameter of type 'void *' [-Werror,-Wint-conversion]
            _mesa_hash_table_insert(&gpl_pipeline_table, key, pipeline_gpl_vert_final[i]);
                                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~
../util/hash_table.h:92:71: note: passing argument to parameter 'data' here
_mesa_hash_table_insert(struct hash_table *ht, const void *key, void *data);
                                                                      ^

Reported by:	pkg-fallout

benchmarks/vkoverhead/Makefile

@@ -14,6 +14,7 @@ WWW=		https://github.com/zmike/vkoverhead
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BROKEN_armv7=	fails to build due -Werror=int-conversion
 BROKEN_i386=	fails to build due -Werror=int-conversion
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}mako>0:textproc/py-mako@${PY_FLAVOR}