l10n: initial git.pot for 1.7.10 upcoming release

The file 'po/git.pot' is generated using the command 'make pot'
against git v1.7.9-209-gb6b3b (Update draft release notes to 1.7.10).

Since po/git.pot is tracked, remove the entry from .gitignore, and
not delete the file again when doing 'make distclean'.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>

Makefile

@@ -2576,7 +2576,6 @@ dist-doc:
 
 distclean: clean
 	$(RM) configure
-	$(RM) po/git.pot
 
 clean:
 	$(RM) *.o block-sha1/*.o ppc/*.o compat/*.o compat/*/*.o xdiff/*.o vcs-svn/*.o \

po/.gitignore

@@ -1,2 +1 @@
-/git.pot
 /build