update gmp to latest upstream

toolchain/gmp/Makefile.inc

@@ -2,9 +2,8 @@
 # material, please see the LICENCE file in the top-level directory.
 
 PKG_NAME:=		gmp
-PKG_VERSION:=		5.1.3
+PKG_VERSION:=		6.0.0a
 PKG_RELEASE:=		1
-PKG_MD5SUM:=		e5fe367801ff067b923d1e6a126448aa
+PKG_MD5SUM:=		1e6da4e434553d2811437aa42c7f7c76
 PKG_SITES:=		${MASTER_SITE_GNU:=gmp/}
-DISTFILES:=		$(PKG_NAME)-$(PKG_VERSION).tar.xz
-GMP_BUILD_DIR:=		$(TOOLCHAIN_BUILD_DIR)/w-$(PKG_NAME)-$(PKG_VERSION)-$(PKG_RELEASE)/$(PKG_NAME)-$(PKG_VERSION)
+WRKDIST=		${WRKDIR}/$(PKG_NAME)-6.0.0

toolchain/mpfr/Makefile

@@ -3,7 +3,6 @@
 
 include $(TOPDIR)/rules.mk
 include ../rules.mk
-include $(TOPDIR)/toolchain/gmp/Makefile.inc
 include Makefile.inc
 include ${TOPDIR}/mk/buildhlp.mk
 
@@ -16,7 +15,6 @@ $(WRKBUILD)/.configured:
 	(cd $(WRKBUILD); \
 		$(WRKBUILD)/configure \
 		--prefix=$(STAGING_HOST_DIR)/usr \
-		--with-gmp-build=$(GMP_BUILD_DIR) \
 		--disable-shared \
 		--enable-static \
 	);