config.mak.in: define paths without trailing slash

The main Makefile defines gitexecdir and template_dir without trailing
slash.  config.mak.in should do the same to be consistent.
Signed-off-by: NPascal Obry <pascal@obry.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

config.mak.in

@@ -13,9 +13,9 @@ TCLTK_PATH = @TCLTK_PATH@
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 bindir = @bindir@
-gitexecdir = @libexecdir@/git-core/
+gitexecdir = @libexecdir@/git-core
 datarootdir = @datarootdir@
-template_dir = @datadir@/git-core/templates/
+template_dir = @datadir@/git-core/templates
 
 mandir=@mandir@