Update to the 20201115 snapshot of GCC 11.0.0.

Forward port part of r555542 | gerald | 2020-11-17 from lang/gcc9-devel:

  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/gcc11-devel/Makefile

@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	gcc
-PORTVERSION=	11.0.0.s20201108
+PORTVERSION=	11.0.0.s20201115
 CATEGORIES=	lang
 MASTER_SITES=	GCC/snapshots/${DIST_VERSION}
 PKGNAMESUFFIX=	${SUFFIX}-devel
@@ -42,8 +42,8 @@ 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
 
@@ -58,8 +58,6 @@ MULTILIB_CONFIGURE_ENABLE=	multilib
 CONFIGURE_ARGS+=	--disable-multilib
 .endif
 
-PLUGINS_CONFIGURE_ENABLE=	plugin
-
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == amd64
@@ -92,6 +90,7 @@ BINMODE=	755
 .endif
 CONFIGURE_ARGS+=--disable-nls \
 		--enable-gnu-indirect-function \
+		--enable-plugin \
 		--libdir=${TARGLIB} \
 		--libexecdir=${LIBEXEC} \
 		--program-suffix=${SUFFIX} \

lang/gcc11-devel/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1604995013
-SHA256 (gcc-11-20201108.tar.xz) = 56aa7737dfb968a57e7cd7d8e1e8d2e02e6944d46c6b12a3c002a160ee7316c5
-SIZE (gcc-11-20201108.tar.xz) = 72759156
+TIMESTAMP = 1605604679
+SHA256 (gcc-11-20201115.tar.xz) = a4a3fc06960a3e3e49f91fdb7d8919d24dc27e70cae0d50ebcd3545fea590371
+SIZE (gcc-11-20201115.tar.xz) = 72867692