Merge branch 'js/test-git-installed'

Update the "test installed Git" mode of our test suite to work better.

* js/test-git-installed:
  tests: explicitly use `git.exe` on Windows
  tests: do not require Git to be built when testing an installed Git
  t/lib-gettext: test installed git-sh-i18n if GIT_TEST_INSTALLED is set
  tests: respect GIT_TEST_INSTALLED when initializing repositories
  tests: fix GIT_TEST_INSTALLED's PATH to include t/helper/

diff --cc Makefile
Simple merge

diff --cc t/lib-gettext.sh
index 755f4214319fb931870b701d4177a32f38849565,9eb160c997a0f4ccaf277d8c8daa655179d18b34..2139b427ca1ced9ba0342ef33d634c9b054ade5e
--- 1/t/lib-gettext.sh
--- 2/t/lib-gettext.sh
+++ b/t/lib-gettext.sh
@@@ -10,9 -10,14 +10,14 @@@ GIT_TEXTDOMAINDIR="$GIT_BUILD_DIR/po/bu
  GIT_PO_PATH="$GIT_BUILD_DIR/po"
  export GIT_TEXTDOMAINDIR GIT_PO_PATH
  
- . "$GIT_BUILD_DIR"/git-sh-i18n
+ if test -n "$GIT_TEST_INSTALLED"
+ then
+       . "$(git --exec-path)"/git-sh-i18n
+ else
+       . "$GIT_BUILD_DIR"/git-sh-i18n
+ fi
  
 -if test_have_prereq GETTEXT && ! test_have_prereq GETTEXT_POISON
 +if test_have_prereq GETTEXT && test_have_prereq C_LOCALE_OUTPUT
  then
        # is_IS.UTF-8 on Solaris and FreeBSD, is_IS.utf8 on Debian
        is_IS_locale=$(locale -a 2>/dev/null |

diff --cc t/test-lib-functions.sh
Simple merge

diff --cc t/test-lib.sh
Simple merge