Update to fix building on macOS 10.14

Note: Python 3 is now needed to build libbsd (because of the bug
https://devel.rtems.org/ticket/3709).

.gitmodules

@@ -1,11 +1,11 @@
 [submodule "rtems"]
 	path = rtems
-	url = https://github.com/grisp/rtems
-	branch = grisp-20171025-patches
+	url = git://git.rtems.org/rtems.git
+	branch = master
 [submodule "rtems-libbsd"]
 	path = rtems-libbsd
-	url = https://github.com/grisp/rtems-libbsd
-	branch = grisp
+	url = git://git.rtems.org/rtems-libbsd.git
+	branch = 5-freebsd-12
 [submodule "rtems-source-builder"]
 	path = rtems-source-builder
 	url = git://git.rtems.org/rtems-source-builder.git

build/build-libbsd.sh

@@ -14,6 +14,8 @@ PROJECTDIR="${SCRIPTDIR}/../"
 . "${SCRIPTDIR}/configuration.sh"
 export PATH="${PREFIX}/bin:${PATH}"
 
+WAF="${PROJECTDIR}/rtems-libbsd/waf"
+
 cd "${LIBBSD_SOURCE_DIR}"
 
 if [ "$BSP_NAME" = "atsamv" ]
@@ -55,15 +57,15 @@ then
 	fi
 fi
 
-waf configure \
+python3 $WAF configure \
 	--prefix="${PREFIX}" \
 	--rtems-bsps="${RTEMS_CPU}/${BSP_NAME}" \
 	--buildset="${SCRIPTDIR}/libbsd-buildset.ini"
-waf
+python3 $WAF
 
 if [ $DO_INSTALL -ne 0 ]
 then
-	waf install
+	python3 $WAF install
 fi
 
 if [ "$BSP_NAME" = "atsamv" ]