buildgcc: move from if test to if [ .. ]

Change-Id: I29fe23e377045f08b8212742d84c2ee2b4a61b15
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10485
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
1 file changed