Squashed 'gitstatus/' changes from 113f1f69..96b520b2

96b520b2 build v1.5.1 binaries for all platforms
ffeb0507 bump version to v1.5.1
1bcbea07 mbuild: disable pacman upgrades on msys
39dbb92f log a warning if unable to parse packed-refs
a9d70ec0 add `-r` flag to gitstatus_start in bash bindings (#241)
abbf9a79 don't use static_assert with one argument as it's not available prior to c++17 (#239)
f8c396e4 drop all tags if packed-refs doesn't have a header line (https://github.com/romkatv/powerlevel10k/issues/1428)

git-subtree-dir: gitstatus
git-subtree-split: 96b520b248ca872646e27b3df4535898356e4637

mbuild

@@ -212,10 +212,11 @@ function build-windows() {
       tmp='/cygdrive/c/tmp'
     ;|
     msys_nt-10.0-*)
-      flags+=(-s)
       tmp='/c/tmp'
       env='MSYSTEM=MSYS'
-      intro='pacman -Syu --noconfirm; pacman -S --needed --noconfirm git; '
+      # TODO: fix this (some errors about PGP keys).
+      # flags+=(-s)
+      # intro='pacman -S --needed --noconfirm git; '
       intro+='PATH="$PATH:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl"'
       while true; do
         # TODO: run autorebase only when getting an error that can be fixed by autorebasing.
@@ -230,6 +231,8 @@ function build-windows() {
       done
       () {
         while true; do
+          # TODO: fix this (some errors about PGP keys).
+          break
           local -i fd
           exec {fd}< <(
             ssh $1 $c/$bin/env.exe $env c:/$bin/bash.exe -l 2>&1 <<<"