add generic support for print version

All presentations can be built in print form if the file

    .lxformat_print

exists in the main directory. If this file does not exist, the
regular beamer format will be generated.

IMPORTANT: The print version of the files are named the same as
           the beamer version!

Signed-off-by: John Ogness <john.ogness@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index a8010fc..d70c93a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@ kconfig-frontends/
 .config.old
 log.txt
 build
+.lxformat_*