meta-google: gnupg: Remove unneeded gnupg help files

This saved 49152 bytes of compressed image space in our platform.

Signed-off-by: Josh Lehan <krellan@google.com>
Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: I40016cffd8586bbcda1cc45ec968efd35c8f4188
diff --git a/meta-google/recipes-support/gnupg/gnupg_%.bbappend b/meta-google/recipes-support/gnupg/gnupg_%.bbappend
new file mode 100644
index 0000000..3f2f4f9
--- /dev/null
+++ b/meta-google/recipes-support/gnupg/gnupg_%.bbappend
@@ -0,0 +1,2 @@
+# Remove unneeded gnupg help files to save space
+EXTRA_OECONF:append:gbmc = " --disable-doc"