checkpkg: set makepkg vars from build root to support none host archs

When building for an architecture different from the host, the correct
old package was downloaded as "$copydir"'s pacman was configured with
the target CARCH, but checkpkg doesn't know this and tries to search the
cache for host CARCH instead, producing the following error:

`==> ERROR: tarball not found for package: xxx`

This change fixes this by passing the appropriate makepkg config
explicitly, so that checkpkg behaves consistently.

Co-Authored-by: Levente Polyak <anthraxx@archlinux.org>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/zsh_completion.in b/zsh_completion.in
index 7a3516a..f640086 100644
--- a/zsh_completion.in
+++ b/zsh_completion.in
@@ -77,6 +77,7 @@ _rebuildpkgs_args=(
 _checkpkg_args=(
 	'(-r --rmdir)'{-r,--rmdir}'[Remove the temporary directory]'
 	'(-w --warn)'{-w,--warn}'[Print a warning in case of differences]'
+	'(-M --makepkg-config)'{-M,--makepkg-config}'[Location of a makepkg config file]:makepkg_config:_files -g "*.conf(.)"'
 	'(-h --help)'{-h,--help}'[Display usage]'
 )