Consistently spell out ONLY_FOR_ARCHS_REASON due to SSE (and other SIMD

instructions) use.  Particularly, saying "SSE extensions" is superfluous,
as SSE abbreviation itself means "Streaming SIMD Extensions".  Correct
way to refer to particular (CPU-agnostic) technology is "SIMD instruction
set", which is not limited to MMX, SSE family, AVX, NEON, etc.

Since "instruction set" looks a bit too formal in the option description,
use more casual and shorter word "instructions".

comms/dabstick-radio/Makefile

@@ -28,13 +28,13 @@ PORTDOCS=	*
 PLIST_FILES+=	bin/dabreceiver bin/fmreceiver bin/spectrum-viewer
 
 ONLY_FOR_ARCHS=		i386 amd64
-ONLY_FOR_ARCHS_REASON=	uses MMX and SSE2
+ONLY_FOR_ARCHS_REASON=	uses MMX and SSE2 instructions
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.options.mk>
 
-.if (${OSVERSION} >= 901000) && exists(${DESTDIR}/usr/bin/clang)
+.if (${OSVERSION} >= 900014) && exists(${DESTDIR}/usr/bin/clang)
 CC=		clang
 CXX=		clang++
 CPP=		clang-cpp

graphics/darktable/Makefile

@@ -18,7 +18,7 @@ LIB_DEPENDS=	libexiv2.so:${PORTSDIR}/graphics/exiv2 \
 		libcurl.so:${PORTSDIR}/ftp/curl
 
 ONLY_FOR_ARCHS=	i386 amd64
-ONLY_FOR_ARCHS_REASON=	uses SSE extensions
+ONLY_FOR_ARCHS_REASON=	uses SSE instructions
 
 USES=		compiler:c++11-lib cmake:outsource desktop-file-utils	\
 		ninja pkgconfig tar:xz

graphics/luxrender/Makefile

@@ -21,7 +21,7 @@ LIB_DEPENDS=	libboost_python.so:${PORTSDIR}/devel/boost-python-libs \
 		libOpenImageIO.so:${PORTSDIR}/graphics/openimageio
 
 ONLY_FOR_ARCHS=	i386 amd64
-ONLY_FOR_ARCHS_REASON=	uses SSE extensions
+ONLY_FOR_ARCHS_REASON=	uses SSE instructions
 
 USES=		bison cmake execinfo python:version tar:bzip2
 USE_GL=		glut glew

graphics/sharpconstruct/Makefile

@@ -18,7 +18,7 @@ USE_GL=		yes
 GNU_CONFIGURE=	yes
 
 ONLY_FOR_ARCHS=	i386 amd64
-ONLY_FOR_ARCHS_REASON=	uses SSE
+ONLY_FOR_ARCHS_REASON=	uses SSE instructions
 
 PLIST_FILES=	bin/${PORTNAME} \
 		man/man1/${PORTNAME}.1.gz