prepare for 7.6.2 release
silence compiler warning
configure: Allow overriding of libgcrypt-config

Allow the overriding of the libgcrypt-config path if it is not at
a standard location.

Signed-off-by: Clayton Shotwell <clshotwe@rockwellcollins.com>
maintain ChangeLog
Merge branch 'v7-stable' into v8-stable

Conflicts:
	ChangeLog
	configure.ac
	doc/manual.html
Merge branch 'v7-stable' into v8-stable

Conflicts:
	ChangeLog