qemu: Allow qemu.sh to be run from any directory

Since qemu.sh is now tied to the directory it's ran from, it makes
sense to change into that directory before starting to resolve any
file paths. This let's us start the script from any directory without
the need for any (cd && qemu) subshell.

board/common/qemu/qemu.sh

@@ -220,6 +220,8 @@ menuconfig()
     exec kconfig-mconf Config.in
 }
 
+cd $(dirname $(readlink -f "$0"))
+
 while [ "$1" != "" ]; do
     case $1 in
 	-c)

external.mk

@@ -11,8 +11,9 @@ local.mk:
 
 .PHONY: run
 run:
-	@(cd $O/images && ./qemu.sh)
+	@$(BINARIES_DIR)/qemu.sh
 
 .PHONY: run-menuconfig
 run-menuconfig:
-	@(cd $O/images && CONFIG_="CONFIG_" BR2_CONFIG=".config" ../build/buildroot-config/mconf Config.in)
+	CONFIG_="CONFIG_" BR2_CONFIG="$(BINARIES_DIR)/.config" \
+		$(BUILD_DIR)/buildroot-config/mconf $(BINARIES_DIR)/Config.in