[PATCH] Bugfix: undefined htmldir in config.mak.autogen

[Jiang Xin <worldhello.net@gmail.com>]

Html documents will be installed to root dir (/) no matter what prefix
is set, if run these commands before `make` and `make install-html`:

    $ make configure
    $ ./configure --prefix=<PREFIX>

After the installation, all the html documents will copy to rootdir (/),
and:

    $ git --html-path
    <PREFIX>

    $ git help -w something
    fatal: '<PREFIX>': not a documentation directory.

This is because the variable "htmldir" points to a undefined variable
"$(docdir)" in file "config.mak.autogen", which is generated by running
`./configure`. This bug comes from commit fc1c541 (Honor configure's
htmldir switch), since v1.8.1.3-537-g1d321.

Add the required two variables "PACKAGE_TARNAME" and "docdir" to file
"config.mak.in" will resolve this problem.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
---
 config.mak.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/config.mak.in b/config.mak.in
index d7c49..fa02bd 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -8,6 +8,7 @@ LDFLAGS = @LDFLAGS@
 AR = @AR@
 TAR = @TAR@
 DIFF = @DIFF@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
 #INSTALL = @INSTALL@		# needs install-sh or install.sh in sources
 
 prefix = @prefix@
@@ -17,6 +18,7 @@ gitexecdir = @libexecdir@/git-core
 datarootdir = @datarootdir@
 template_dir = @datadir@/git-core/templates
 sysconfdir = @sysconfdir@
+docdir = @docdir@
 
 mandir = @mandir@
 htmldir = @htmldir@
-- 
1.8.2.rc0.18.g63af42f.dirty