fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Patch `configure` and the shipped `intltool.m4` macro file to make a missing
XML::Parser perl module nonfatal.

All utilities provided by intltool are programmed to fail gracefully at run
time if the module cannot be loaded and those utilities commonly used during
the build do not require it at all.

Also drop the the build-prereq on XML::Parser now that it is optional.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Signed-off-by: Ted Hess <thess@kitschensync.net>