remove unused pkgconfig template
libalpm uses meson's pkgconfig module which does not use the template
file.
Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
meson.build: add _FILE_OFFSET_BITS to pkgconfig
Meson automatically sets _FILE_OFFSET_BITS but that value was not
getting carried through to the libalpm pkgconfig file, breaking
downstream projects that relied on it.
Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>