Import libretro-nestopia, split from the existing libretro port.

From Ryan Freeman; thanks!

emulators/libretro-nestopia/Makefile

@@ -0,0 +1,46 @@
+COMMENT =		Nintendo Entertainment System core for retroarch
+
+V =			1.51.1
+DISTNAME =		libretro-nestopia-$V
+
+GH_ACCOUNT =		libretro
+GH_PROJECT =		nestopia
+GH_COMMIT =		a9e197f2583ef4f36e9e77d930a677e63a2c2f62
+
+.include <bsd.port.arch.mk>
+
+CATEGORIES =		emulators
+
+HOMEPAGE =		https://github.com/libretro/nestopia
+
+MAINTAINER =		Ryan Freeman <ryan@slipgate.org>
+
+# GPLv2+
+PERMIT_PACKAGE =	Yes
+
+WANTLIB =		${COMPILER_LIBCXX} m pthread
+
+COMPILER =		base-clang ports-gcc base-gcc
+
+BUILD_DEPENDS =		devel/autoconf-archive
+LIB_DEPENDS =		${MODGCC4_CPPLIBDEP}
+
+MAKE_FLAGS =		CC="${CC}" \
+			CXX="${CXX}" \
+			CFLAGS="${CFLAGS}" \
+			CXXFLAGS="${CFLAGS} \
+				-Ilibretro-common/include -Wno-narrowing"
+FAKE_FLAGS =		PREFIX="${WRKINST}/${TRUEPREFIX}"
+
+USE_GMAKE =		Yes
+
+NO_TEST =		Yes
+
+WRKSRC =		${WRKDIST}/libretro
+
+do-install:
+	${INSTALL_DATA_DIR} ${PREFIX}/lib/libretro
+	${INSTALL_DATA} ${WRKSRC}/nestopia_libretro.so \
+		${PREFIX}/lib/libretro
+
+.include <bsd.port.mk>

emulators/libretro-nestopia/distinfo

@@ -0,0 +1,2 @@
+SHA256 (libretro-nestopia-1.51.1-a9e197f2.tar.gz) = E3K7KaAsQ2YDlHnREVyJDYTN3Qf6RDhDBQaSQ1w4dss=
+SIZE (libretro-nestopia-1.51.1-a9e197f2.tar.gz) = 1121493

emulators/libretro-nestopia/patches/patch-libretro_Makefile

@@ -0,0 +1,12 @@
+Index: libretro/Makefile
+--- libretro/Makefile.orig
++++ libretro/Makefile
+@@ -63,7 +63,7 @@ unixcygpath = /$(subst :,,$(call unixpath,$1))
+ ifeq ($(platform), unix)
+ 	TARGET := $(TARGET_NAME)_libretro.so
+ 	fpic := -fPIC
+-	SHARED := -shared -Wl,-version-script=link.T -Wl,-no-undefined
++	SHARED := -shared -Wl,-version-script=link.T
+ ifeq ($(shell uname -s), Haiku)
+ 	LDFLAGS += -lroot
+ endif

emulators/libretro-nestopia/pkg/DESCR

@@ -0,0 +1,2 @@
+libretro-nestopia provides a Nintendo Entertainment System emulation core to
+the RetroArch emulator frontend, based on Nestopia.

emulators/libretro-nestopia/pkg/PLIST

@@ -0,0 +1,2 @@
+lib/libretro/
+lib/libretro/nestopia_libretro.so