scripts/install-buildtools: Handle new format checksum files

Autobuilder generated checksum files only have a single space between the sum and the
filename, tweak it to account for this.

(From OE-Core rev: d1e71bf5b399372166eb40bb0d99c8fb52231600)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/install-buildtools

@@ -241,7 +241,7 @@ def main():
                 if ret != 0:
                     logger.error("Could not download file from %s" % check_url)
                     return ret
-            regex = re.compile(r"^(?P<checksum>[0-9a-f]+)\s\s(?P<path>.*/)?(?P<filename>.*)$")
+            regex = re.compile(r"^(?P<checksum>[0-9a-f]+)\s+(?P<path>.*/)?(?P<filename>.*)$")
             with open(tmpbuildtools_checksum, 'rb') as f:
                 original = f.read()
                 m = re.search(regex, original.decode("utf-8"))