math/clfft: Set USE_CXXSTD to gnu98 after the recent LLVM6 import. While there, pet portlint and change to my FreeBSD.org address.

math/clfft/Makefile

@@ -4,9 +4,10 @@
 PORTNAME=	clfft
 PORTVERSION=	2.12.2
 DISTVERSIONPREFIX=	v
+PORTREVISION=	1
 CATEGORIES=	math
 
-MAINTAINER=	dieterich@ogolem.org
+MAINTAINER=	jmd@FreeBSD.org
 COMMENT=	Software library containing FFT functions written in OpenCL
 
 LICENSE=	APACHE20
@@ -19,13 +20,14 @@ RUN_DEPENDS=	opencl>=0:devel/opencl
 ONLY_FOR_ARCHS=	amd64
 ONLY_FOR_ARCHS_REASON_amd64=	only builds and is supported on amd64
 
+USES=		cmake
+USE_LDCONFIG=	yes
+USE_CXXSTD=	gnu++98
+
 USE_GITHUB=	yes
 GH_ACCOUNT=	clMathLibraries
 GH_PROJECT=	clFFT
 
-USE_LDCONFIG=	yes
-USES=		cmake
-
 CMAKE_ARGS+=	-DBUILD_CLIENT=OFF \
 		-DBUILD_TEST=OFF \
 		-DBUILD_CALLBACK_CLIENT=OFF \