added build dir to gitignore

Gernot Knieling · Gernot Knieling · commit ec80a16c9519 · 2019-12-18T09:07:26.000+01:00
diff --git a/.gitignore b/.gitignore
@@ -24,3 +24,4 @@ Makefile.in
 /sigc++config.h
 /sigc++-*.pc
 /stamp-h?
+/libsigcplusplus_build
