makepkg: unset GREP_OPTIONS

grep allows options to be set from the environment with GREP_OPTIONS.
Many of these options will alter grep's output, breaking makepkg.
GREP_OPTIONS=--line-number breaks installed dependency removal, for
instance.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>
Improve documentation of libalpm interface functions

Add details to the doxygen for the initialization and relase functions
of the library.

Signed-off-by: Richard Pougnet <richard@pougnet.ca>
Signed-off-by: Allan McRae <allan@archlinux.org>
pm_asprintf logs 'failed to allocate' already

Signed-off-by: Simon Gomizelj <simongmzlj@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>