[clangd] Don't maintain a list of c-family extensions in vscode extension.
[clangd] Don't maintain a list of c-family extensions in vscode extension.

Summary:
There is no need to maintain this list by ourself, vscode already
provides this feature.

Reviewers: kadircet

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D63323

git-svn-id: a34e9779ed74578ad5922b3306b3d80a0c825546@363372 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra