Update to the 20201113 snapshot of GCC 9.3.1.

This brings two backports for the x86 back end, two for the Fortran
front end, and one for libstdc++.

Fold the PLUGINS option, which has been on by default, into standard
behavior and remove that option.  It has not been causing any issues
since we enabled it 11 months ago, nor measurable overhead. [1]

PR:		242644 [1]

lang/gcc9-devel/Makefile

@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	gcc
-PORTVERSION=	9.3.1.s20201106
+PORTVERSION=	9.3.1.s20201113
 CATEGORIES=	lang
 MASTER_SITES=	GCC/snapshots/${DIST_VERSION}
 PKGNAMESUFFIX=	${SUFFIX}-devel
@@ -44,8 +44,8 @@ SUFFIX=		${PORTVERSION:C/([0-9]+).*/\1/}
 CFLAGS:=	${CFLAGS:N-mretpoline}
 CXXFLAGS:=	${CXXFLAGS:N-mretpoline}
 
-OPTIONS_DEFINE=		BOOTSTRAP GRAPHITE PLUGINS
-OPTIONS_DEFAULT=	BOOTSTRAP PLUGINS
+OPTIONS_DEFINE=		BOOTSTRAP GRAPHITE
+OPTIONS_DEFAULT=	BOOTSTRAP
 BOOTSTRAP_DESC=		Build using a full bootstrap
 GRAPHITE_DESC=		Support for Graphite loop optimizations
 
@@ -60,8 +60,6 @@ MULTILIB_CONFIGURE_ENABLE=	multilib
 CONFIGURE_ARGS+=	--disable-multilib
 .endif
 
-PLUGINS_CONFIGURE_ENABLE=	plugin
-
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == amd64
@@ -95,6 +93,7 @@ BINMODE=	755
 .endif
 CONFIGURE_ARGS+=--disable-nls \
 		--enable-gnu-indirect-function \
+		--enable-plugin \
 		--libdir=${TARGLIB} \
 		--libexecdir=${LIBEXEC} \
 		--program-suffix=${SUFFIX} \

lang/gcc9-devel/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1604703943
-SHA256 (gcc-9-20201106.tar.xz) = 080d2840c16be0d6ca6a21da9908b7e1840700b9a23d16b9aa491e6b5a85d93d
-SIZE (gcc-9-20201106.tar.xz) = 67602880
+TIMESTAMP = 1605355575
+SHA256 (gcc-9-20201113.tar.xz) = 84376ef0ee749441eaf7821c7cd0b6622b3594114ab8028bc57ff96fa721b9ad
+SIZE (gcc-9-20201113.tar.xz) = 67606496