Fix libphonenumber build

This MR aims to fix the compilation errors associated with building libphonenumber.bst, and thus, chatty.bst.

The MR does the following:

• Adds CMake arguments to libphonenumber.bst
• Neatens the freedesktop-sdk.bst file with blank lines
• Adds a patch file to the freedesktop-sdk.bst
  • This patch files adds additional CMake arguments to:
    • elements/components/abseil-cpp.bst
    • elements/components/protobuf-base.bst

This MR bases itself on the flathub/org.gnome.Calls. setup

Part of: #726 (closed)

Fixes #744 (closed)