Merge branch 'mg/lib-gpg-ro-safety'

In a tarball extract whose files are all read-only, running GPG
tests would have failed due to unwritable files.

* mg/lib-gpg-ro-safety:
  t/lib-gpg: make gpghome files writable

Author: gitster

t/lib-gpg.sh

@@ -18,6 +18,7 @@ else
 		# No password given, to enable non-interactive operation.
 		cp -R "$TEST_DIRECTORY"/lib-gpg ./gpghome
 		chmod 0700 gpghome
+		chmod 0600 gpghome/*
 		GNUPGHOME="$(pwd)/gpghome"
 		export GNUPGHOME
 		test_set_prereq GPG