databases/grass7: check for omp.h on all architectures

databases/grass7/Makefile

@@ -131,6 +131,10 @@ SQLITE_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${PY_F
 ZSTD_CONFIGURE_WITH=	zstd
 ZSTD_LIB_DEPENDS=	libzstd.so:archivers/zstd
 
+.if exists(/usr/include/omp.h)
+CONFIGURE_ARGS+=	--with-openmp
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "i386"
@@ -140,10 +144,6 @@ PLIST_SUB+=	NOTONI386="@comment "
 PLIST_SUB+=	NOTONI386=""
 .endif
 
-.if ${ARCH} != powerpc
-CONFIGURE_ARGS+=	--with-openmp
-.endif
-
 .if !defined (GRASS_INST_DIR)
 GRASS_INST_DIR=	${PORTNAME}${VER}
 .endif