Add .deps and .dirstamp to .gitignore to allow use as submodule in automake projects.

Author: graydon

.gitignore

@@ -22,7 +22,8 @@ manual/t*.bbl
 manual/t*.blg
 profiler/build/win32/packages
 profiler/build/win32/Tracy.aps
-
 # include the vcpkg install script but not the files it produces
 vcpkg/*
 !vcpkg/install_vcpkg_dependencies.bat
+.deps/
+.dirstamp