Ignore build-vc150-* directories as those are the VS2017 build dirs (n.b. due...

Ignore build-vc150-* directories as those are the VS2017 build dirs (n.b. due to the rather strange version numbering of VS this really should be build-vc141-*; as VS2017 is vc141 internally).

.gitignore

@@ -12,14 +12,17 @@
 LICENSES
 build-darwin-*
 build-linux-*
-build-stamp
-build-vc120*
-build-vc150*
-configure-stamp
 debian/files
 debian/secondlife-appearance-utility*
 debian/secondlife-viewer*
 indra/.distcc
+build-vc80/
+build-vc100/
+build-vc120/
+build-vc120-32/
+build-vc120-64/
+build-vc150-32/
+build-vc150-64/
 indra/CMakeFiles
 indra/build-vc[0-9]*
 indra/lib/mono/1.0/*.dll