devel/aws-c-event-stream: Port improvements

 - Define LICENSE_FILE
 - Use ports framework for unit testing
 - Use CMake helpers provided by framework
 - Turn off BUILD_TESTING by default
 - Bump PORTREVISION

devel/aws-c-event-stream/Makefile

 PORTNAME=	aws-c-event-stream
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.2.14
-PORTREVISION=	1
+PORTREVISION=	2
 PORTEPOCH=	1
 CATEGORIES=	devel
 
@@ -10,6 +10,7 @@ COMMENT=	C99 implementation of the vnd.amazon.eventstream content-type
 WWW=		https://github.com/awslabs/aws-c-event-stream
 
 LICENSE=	APACHE20
+LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libaws-c-cal.so:security/aws-c-cal \
 		libaws-c-common.so:devel/aws-c-common \
@@ -17,15 +18,17 @@ LIB_DEPENDS=	libaws-c-cal.so:security/aws-c-cal \
 		libaws-checksums.so:devel/aws-checksums \
 		libs2n.so:security/s2n-tls
 
-USES=		cmake compiler:c11 ssl
+USES=		cmake:testing compiler:c11 ssl
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	awslabs
 
 USE_LDCONFIG=	yes
 
-CMAKE_ARGS+=	-DBUILD_SHARED_LIBS=ON \
-		-DCMAKE_INSTALL_LIBDIR=${LOCALBASE}/lib
+CMAKE_ARGS+=	-DCMAKE_INSTALL_LIBDIR=${LOCALBASE}/lib
+CMAKE_ON=	BUILD_SHARED_LIBS
+CMAKE_OFF=	BUILD_TESTING
+
 LDFLAGS+=	-lexecinfo -lpthread
 
 PORTSCOUT=	limit:^d\.d\.