science/simgrid: Remove dependency on devel/libunwind

devel/libunwind causes mixup with base headers.

science/simgrid/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	SimGrid
 DISTVERSION=	3.28
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	science
 
 MAINTAINER=	yuri@FreeBSD.org
@@ -12,12 +12,6 @@ LICENSE_FILE=	${WRKSRC}/LICENSE-LGPL-2.1
 LIB_DEPENDS=	libboost_context.so:devel/boost-libs \
 		libcgraph.so:graphics/graphviz \
 		${LIB_DEPENDS_${ARCH}}
-LIB_DEPENDS_aarch64=	libunwind.so:devel/libunwind
-LIB_DEPENDS_amd64=	libunwind.so:devel/libunwind
-LIB_DEPENDS_armv7=	libunwind.so:devel/libunwind
-LIB_DEPENDS_i386=	libunwind.so:devel/libunwind
-LIB_DEPENDS_powerpc64=	libunwind.so:devel/libunwind
-LIB_DEPENDS_powerpc64le=	libunwind.so:devel/libunwind
 
 USES=		cmake:noninja compiler:c++14-lang perl5 python:3.6+ shebangfix
 SHEBANG_FILES=	tools/simgrid_convert_TI_traces.py