devel/libunwind: fix packaging on powerpc64*

pkg-static: Unable to access file /wrkdirs/usr/ports/devel/libunwind/work/stage/usr/local/include/libunwind-ppc3264le.h:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/libunwind/work/stage/usr/local/lib/libunwind-ppc3264le.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/libunwind/work/stage/usr/local/lib/libunwind-ppc3264le.so:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/libunwind/work/stage/usr/local/lib/libunwind-ppc3264le.so.8:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/libunwind/work/stage/usr/local/lib/libunwind-ppc3264le.so.8.0.1:No such file or directory

devel/libunwind/Makefile

@@ -27,7 +27,7 @@ GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 USE_LDCONFIG=	yes
 
-PLIST_SUB=	ARCH=${ARCH:S|amd64|x86_64|:C|armv.|arm|:S|i386|x86|:S|powerpc|ppc32|:C|powerpc64.*|ppc64|}
+PLIST_SUB=	ARCH=${ARCH:S|amd64|x86_64|:C|armv.|arm|:S|i386|x86|:C|powerpc64.*|ppc64|:S|powerpc|ppc32|}
 
 CPE_VENDOR=	libunwind_project