Update .gitignore.

Remove generated files that are now written to the build dir instead.

Match any build directory from root.

Stop listing submodule and vcpkg.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

.gitignore

@@ -1,13 +1,4 @@
-src/wx/builtin-over.h
-src/wx/builtin-xrc.h
-src/wx/cmd-evtable.h
-src/wx/cmdhandlers.h
-src/wx/cmdtab.cpp
-src/wx/wxvbam.xrs
-*build*/*
-cmake-build*
-dependencies/*
-vcpkg/*
+/*build*/*
 .vs/*
 .idea
 *.o