gettext: don't patch different the host and target build

gettext: don't patch different the host and target build

Until now, the gettext source code was being patched differently for
the host and the target build, which is going to be incompatible with
out-of-tree build. The difference is that the gettext tools could be
disabled in the target build, but are always enabled on the host
build.

Therefore, this commit switches the gettext package to using proper
patches against the relevant configure.ac and Makefile.am
files. gettext is now being autoreconfigured. Configuration options
are also passed for the host variant, in order to disable the build of
a large number of things we don't care about.

Finally, the two existing patches are renamed to include a number in
their filename.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>