wmbiff: added .gitignore.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>

wmbiff/.gitignore

@@ -0,0 +1,30 @@
+/aclocal.m4
+/autom4te.cache/
+/compile
+/config.*
+/configure
+*.c~
+/depcomp
+.deps/
+*.h~
+/INSTALL
+/install-sh
+Makefile
+Makefile.in
+/missing
+*.o
+/stamp-h1
+/test-driver
+/wmbiff-*.tar.gz
+/wmbiff/test-suite.log
+/wmbiff/test_tlscomm
+/wmbiff/test_tlscomm.log
+/wmbiff/test_tlscomm.trs
+/wmbiff/test_wmbiff
+/wmbiff/test_wmbiff.log
+/wmbiff/test_wmbiff.trs
+/wmbiff/wmbiff
+/wmbiff/wmbiff-classic-master-contrast.xpm
+/wmbiff/wmbiff-master-contrast.xpm
+/wmbiff/wmbiffrc.5
+/wmgeneral/libwmgeneral.a