add .gitignore to official repository

This .gitignore make the output of git status a lot more readable. It was
made from the dynamically generated files that showed after using both
build system.

Signed-off-by: Samuli Seppänen <samuli@openvpn.ne>
Signed-off-by: Heiko Hund <heiko.hund@sophos.com>
Acked-By: David Sommerseth <davids@redhat.com>
Signed-off-by: David Sommerseth <davids@redhat.com>

.gitignore

@@ -0,0 +1,40 @@
+*.[oa]
+*.dll
+*.exe
+*.mak
+*.obj
+*.pyc
+*.so
+.deps
+Makefile
+Makefile.in
+aclocal.m4
+autodefs.h
+autom4te.cache
+config.guess
+config.h
+config.h.in
+config.log
+config.status
+config.sub
+configure
+configure.h
+depcomp
+dist/
+install-sh
+install-win32/settings
+install-win32/tmp
+missing
+openvpn
+openvpn.8.html
+openvpn.exe.manifest
+openvpnserv.exe.manifest
+openvpn.spec
+stamp-h1
+t_client.sh
+tap-win32/SOURCES
+tap-win32/amd64/
+tap-win32/i386/
+tapinstall/
+vc90.idb
+win/version_m4_vars.tmp