env/darwin/aws: don't quote extra args

We do not want to quote $EXTRA_ARGS, as we explicitly want them split
into multiple arguments to qemu. This fixes start-installer.sh.

For golang/go#48945.

Change-Id: I6659f74120be534e9d909bcff85151011f8addd2
Reviewed-on: https://go-review.googlesource.com/c/build/+/432856
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/env/darwin/aws/qemu.sh b/env/darwin/aws/qemu.sh
index f1356fc..0ddca2c 100755
--- a/env/darwin/aws/qemu.sh
+++ b/env/darwin/aws/qemu.sh
@@ -43,4 +43,4 @@
   -display vnc=127.0.0.1:"$PORT"
 )
 
-DYLD_LIBRARY_PATH="$HOME/sysroot-macos-x86_64/lib" "$HOME/sysroot-macos-x86_64/bin/qemu-system-x86_64" "${args[@]}" ${EXTRA_ARGS:+"$EXTRA_ARGS"}
+DYLD_LIBRARY_PATH="$HOME/sysroot-macos-x86_64/lib" "$HOME/sysroot-macos-x86_64/bin/qemu-system-x86_64" "${args[@]}" ${EXTRA_ARGS:+$EXTRA_ARGS}