Tidy up .gitignore

Author: svenvh

.gitignore

@@ -1,9 +1,6 @@
 #==============================================================================#
 # This file specifies intentionally untracked files that git should ignore.
 # See: http://www.kernel.org/pub/software/scm/git/docs/gitignore.html
-#
-# This file is intentionally different from the output of `git svn show-ignore`,
-# as most of those are useless.
 #==============================================================================#
 
 build/
@@ -40,29 +37,3 @@ cscope.out
 autoconf/aclocal.m4
 autoconf/autom4te.cache
 compile_commands.json
-
-#==============================================================================#
-# Directories to ignore (do not add trailing '/'s, they skip symlinks).
-#==============================================================================#
-# External projects that are tracked independently.
-projects/*
-!projects/CMakeLists.txt
-!projects/Makefile
-# Clang, which is tracked independently.
-tools/clang
-# LLDB, which is tracked independently.
-tools/lldb
-# lld, which is tracked independently.
-tools/lld
-# llgo, which is tracked independently.
-tools/llgo
-# Polly, which is tracked independently.
-tools/polly
-# Sphinx build tree, if building in-source dir.
-docs/_build
-
-#==============================================================================#
-# Files created in tree by the Go bindings.
-#==============================================================================#
-bindings/go/llvm/llvm_config.go
-bindings/go/llvm/workdir