makepkg: make in-place sed portable

Do a sed replacement in-place is not very portable.  On Mac OSX and
BSDs, the syntax is "sed -i ''" where as with GNU sed the command is
"sed -i''" or just "sed -i".  This patch detects which command should
be used during configure.

Credit to Kevin Barry who researched this issue and provided a patch
to work around this using temporary backup files.

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

0 files changed, 0 insertions, 0 deletions