build: fixes for native arm build

R=kaib
CC=golang-dev
https://golang.org/cl/2254044

src/Make.inc

@@ -42,7 +42,7 @@ ifeq ($(GOOS),darwin)
 GOARCH:=${shell if sysctl machdep.cpu.extfeatures | grep EM64T >/dev/null; then echo amd64; else uname -m | sed 's/i386/386/'; fi}
 else
 # Ask uname -m for the processor.
-GOARCH:=${shell uname -m | sed 's/^..86$$/386/; s/^.86$$/386/; s/x86_64/amd64/'}
+GOARCH:=${shell uname -m | sed 's/^..86$$/386/; s/^.86$$/386/; s/x86_64/amd64/; s/arm.*/arm/'}
 endif
 endif
 

test/run

@@ -14,7 +14,7 @@ X386)
 	;;
 Xarm)
 	export A=5
-	export E=${GORUN:-qemu-arm -cpu cortex-a8}
+	export E="$GORUN"
 	;;
 *)
 	echo 1>&2 run: unsupported '$GOARCH'

test/run-arm

@@ -13,7 +13,7 @@ X386)
 	;;
 Xarm)
 	export A=5
-	export E="${GORUN:-qemu-arm -cpu cortex-a8}"
+	export E="$GORUN"
 	;;
 *)
 	echo 1>&2 run: unsupported '$GOARCH'