add .gitignore

Signed-off-by: Luc Verhaegen <libv@skynet.be>

.gitignore

+*~
+*.o
+*.lo
+*.la
+*.in
+*.pc
+.deps/
+.libs/
+config.*
+configure
+Makefile
+autom4te.cache/
+stamp-h1
+missing
+ltmain.sh
+libtool
+install-sh
+depcomp
+aclocal.m4
+src/ump.h