graphics/rawtherapee: drop USE_GCC...

...to unblock the GCC-13-as-default upgrade.

PR:		273682
Reported by:	salvadore@

graphics/rawtherapee/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	rawtherapee
 PORTVERSION=	5.9
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	graphics
 MASTER_SITES=	https://rawtherapee.com/shared/source/ \
 		LOCAL/mandree/
@@ -25,27 +25,15 @@ LIB_DEPENDS=	\
 		libsigc-2.0.so:devel/libsigc++20 \
 		libtiff.so:graphics/tiff
 
-USES=		cmake desktop-file-utils compiler:gcc-c++11-lib gnome \
+USES=		cmake desktop-file-utils compiler:c++11-lang gnome \
 		jpeg localbase:ldflags pkgconfig tar:xz
 
 # Binutils required for LTO (base ar/nm/ld/ranlib don't work)
 USE_BINUTILS=	yes
 
-# As of 2019-09-29, this port is known to be miscompiled by clang90
-# (SIGSEGV or SIBGUS).
-# So we shall stick to a modern GCC for now,
-# XXX FIXME note that rawtherapee is somewhat sensitive
-# versus compiler details so we may need to pin GCC 9.x
-# or a version range.
-USE_GCC=	yes
-
 USE_GNOME=	gtkmm30 librsvg2
 
-_LTO_FLAGS=	-flto=${MAKE_JOBS_NUMBER}
-# gcc needs -flto=${MAKE_JOBS_NUMBER} for parallel link (fixed in GCC 10?)
-#     and does not understand -flto=thin
-#
-# llvm/clang needs -flto=thin and will automatically parallelize the link
+_LTO_FLAGS=	-flto=thin
 
 # Fix <https://bugs.freebsd.org/251041>:
 # 11.x has binutils that don't accept a --plugin option,
@@ -64,9 +52,8 @@ CMAKE_ARGS+=	-DDOCDIR="${DOCSDIR}" \
 		-DDATADIR="${DATADIR}" \
 		-DCACHE_NAME_SUFFIX="" \
 		-Wno-dev \
-		-DCMAKE_AR:FILEPATH=${_AR} \
-		-DCMAKE_RANLIB:FILEPATH=${_RANLIB} \
 		-DCMAKE_POLICY_DEFAULT_CMP0056:STRING=NEW
+
 # 3.4.x: CMAKE_EXE_LINKER_FLAGS is not passed to TRY_COMPILE by default
 # any more. The CMP0056 policy must be explicitly set to NEW to ensure
 # linker flags are passed. Else -lomp is not found with clang.