graphics/libavif: Clean up Makefile

Remove unnecessary :STRING

graphics/libavif/Makefile

@@ -18,15 +18,15 @@ TEST_DEPENDS=	bash:shells/bash \
 
 USES=		cmake:testing compiler:c11 cpe jpeg pkgconfig
 
-CMAKE_ARGS=	-DAVIF_GTEST:STRING=OFF \
-		-DAVIF_FUZZTEST:STRING=OFF \
-		-DAVIF_JPEG:STRING=SYSTEM \
-		-DAVIF_LIBYUV:STRING=SYSTEM \
-		-DAVIF_ZLIBPNG:STRING=SYSTEM
+CMAKE_ARGS=	-DAVIF_GTEST=OFF \
+		-DAVIF_FUZZTEST=OFF \
+		-DAVIF_JPEG=SYSTEM \
+		-DAVIF_LIBYUV=SYSTEM \
+		-DAVIF_ZLIBPNG=SYSTEM
 CMAKE_OFF=	AVIF_BUILD_EXAMPLES \
 		AVIF_BUILD_TESTS
 CMAKE_ON=	AVIF_BUILD_APPS
-CMAKE_TESTING_ARGS=	-DAVIF_GTEST:STRING=SYSTEM
+CMAKE_TESTING_ARGS=	-DAVIF_GTEST=SYSTEM
 CMAKE_TESTING_ON=	AVIF_BUILD_TESTS
 LDFLAGS+=	-lm
 USE_LDCONFIG=	yes
@@ -50,31 +50,31 @@ MANPAGES_DESC=		Install manpages (requires pandoc)
 RAV1E_DESC=		AV1 encoding via librav1e
 SVTAV1_DESC=		AV1 encoding via SVT-AV1
 
-AOM_CMAKE_OFF=		-DAVIF_CODEC_AOM:STRING=OFF
-AOM_CMAKE_ON=		-DAVIF_CODEC_AOM:STRING=SYSTEM
+AOM_CMAKE_OFF=		-DAVIF_CODEC_AOM=OFF
+AOM_CMAKE_ON=		-DAVIF_CODEC_AOM=SYSTEM
 AOM_LIB_DEPENDS=	libaom.so:multimedia/aom
-DAV1D_CMAKE_OFF=	-DAVIF_CODEC_DAV1D:STRING=OFF
-DAV1D_CMAKE_ON=		-DAVIF_CODEC_DAV1D:STRING=SYSTEM
+DAV1D_CMAKE_OFF=	-DAVIF_CODEC_DAV1D=OFF
+DAV1D_CMAKE_ON=		-DAVIF_CODEC_DAV1D=SYSTEM
 DAV1D_LIB_DEPENDS=	libdav1d.so:multimedia/dav1d
-GAV1_CMAKE_OFF=		-DAVIF_CODEC_LIBGAV1:STRING=OFF
-GAV1_CMAKE_ON=		-DAVIF_CODEC_LIBGAV1:STRING=SYSTEM
+GAV1_CMAKE_OFF=		-DAVIF_CODEC_LIBGAV1=OFF
+GAV1_CMAKE_ON=		-DAVIF_CODEC_LIBGAV1=SYSTEM
 GAV1_LIB_DEPENDS=	libgav1.so:multimedia/libgav1
-LIBSHARPYUV_CMAKE_OFF=	-DAVIF_LIBSHARPYUV:STRING=OFF
-LIBSHARPYUV_CMAKE_ON=	-DAVIF_LIBSHARPYUV:STRING=SYSTEM
+LIBSHARPYUV_CMAKE_OFF=	-DAVIF_LIBSHARPYUV=OFF
+LIBSHARPYUV_CMAKE_ON=	-DAVIF_LIBSHARPYUV=SYSTEM
 LIBSHARPYUV_LIB_DEPENDS=libsharpyuv.so:graphics/webp
 MANPAGES_BUILD_DEPENDS=	pandoc:textproc/hs-pandoc
 MANPAGES_CMAKE_BOOL=	AVIF_BUILD_MAN_PAGES
 PIXBUF_CMAKE_BOOL=	AVIF_BUILD_GDK_PIXBUF
 PIXBUF_USE=		GNOME=gdkpixbuf
 PIXBUF_USES=		gnome
-RAV1E_CMAKE_OFF=	-DAVIF_CODEC_RAV1E:STRING=OFF
-RAV1E_CMAKE_ON=		-DAVIF_CODEC_RAV1E:STRING=SYSTEM
+RAV1E_CMAKE_OFF=	-DAVIF_CODEC_RAV1E=OFF
+RAV1E_CMAKE_ON=		-DAVIF_CODEC_RAV1E=SYSTEM
 RAV1E_LIB_DEPENDS=	librav1e.so:multimedia/librav1e
-SVTAV1_CMAKE_OFF=	-DAVIF_CODEC_SVT:STRING=OFF
-SVTAV1_CMAKE_ON=	-DAVIF_CODEC_SVT:STRING=SYSTEM
+SVTAV1_CMAKE_OFF=	-DAVIF_CODEC_SVT=OFF
+SVTAV1_CMAKE_ON=	-DAVIF_CODEC_SVT=SYSTEM
 SVTAV1_LIB_DEPENDS=	libSvtAv1Enc.so:multimedia/svt-av1
-LIBXML2_CMAKE_OFF=	-DAVIF_LIBXML2:STRING=OFF
-LIBXML2_CMAKE_ON=	-DAVIF_LIBXML2:STRING=SYSTEM
+LIBXML2_CMAKE_OFF=	-DAVIF_LIBXML2=OFF
+LIBXML2_CMAKE_ON=	-DAVIF_LIBXML2=SYSTEM
 LIBXML2_USE=		GNOME=libxml2
 LIBXML2_USES=		gnome