test.bash: execute build-without-openssl.bash instead of sourcing it

Sourcing the script breaks the "cd $(dirname $0)" logic in
build-without-openssl.bash.

test.bash

@@ -24,10 +24,10 @@ for i in $(mount | grep $TESTDIR | cut -f3 -d" "); do
 	fuse-unmount $i
 done
 
-source build-without-openssl.bash
+./build-without-openssl.bash
 # Building with openssl is difficult on OSX, so only do it on Linux.
 if [[ $OSTYPE == linux* ]] ; then
-	source build.bash
+	./build.bash
 fi
 
 if go tool | grep vet > /dev/null ; then