emulators/higan: unbreak on powerpc64, make ports tree compliant

Builds fine on powerpc64 without -march=native, which shouldn't be enabled anyway.

MFH:		2020Q1 (fix build blanket)

emulators/higan/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	higan
 PORTVERSION=	106
-PORTREVISION=	5
+PORTREVISION=	6
 CATEGORIES=	emulators games
 MASTER_SITES=	http://download.byuu.org/ \
 		http://www.cyberbotx.com/higan/
@@ -12,7 +12,7 @@ DISTNAME=	${PORTNAME}_v${PORTVERSION}-source
 MAINTAINER=	cyberbotx@cyberbotx.com
 COMMENT=	Nintendo multi-system emulator
 
-ONLY_FOR_ARCHS=	amd64 i386
+ONLY_FOR_ARCHS=	amd64 i386 powerpc64
 
 LIB_DEPENDS=	libfontconfig.so:x11-fonts/fontconfig \
 		libfreetype.so:print/freetype2

emulators/higan/files/patch-higan_GNUmakefile

@@ -0,0 +1,10 @@
+--- higan/GNUmakefile.orig	2020-02-08 23:13:45 UTC
++++ higan/GNUmakefile
+@@ -26,7 +26,6 @@ else ifneq ($(filter $(platform),linux bsd),)
+   flags += -fopenmp
+   link += -fopenmp
+   ifeq ($(binary),application)
+-    flags += -march=native
+     link += -Wl,-export-dynamic
+     link += -lX11 -lXext
+   else ifeq ($(binary),library)