makepkg: clean-up of output messages

makepkg: clean-up of output messages

There was a lot of inconsistency in how strings that should not be
translated (program names, option flags, PKGBUILD directives, etc) were
handled. This patch moves them all outside the gettext invocation for
consistency and to prevent accidental translation.

Note that some of these may need reverted if they cause difficulties in
translation due to gettext usage in bash not taking positional parameters
for arguments. A quick survey of current translations indicates that this
issue will be rare.  Also, we should be able to catch these before a full
string freeze given we are going to probably need a "developer preview"
release before the next release series.

Signed-off-by: Allan McRae <allan@archlinux.org>