* .ccls: Remove -std=c99: it disables __attribute__ causing warnings.
* .dir-locals.el: Force the C coding style to "gnu".
* make-gdb.py: Add GDB macros for pretty-printing GNU make structs.
* scripts/copyright-update: Use GNULIB_SRCDIR to find update-copyright.
* .ccls: Configure the ccls LSP server
* .dir-locals.el: Reset some parameters for ccls and lsp-mode
* .gitignore: Update for GTAGS and ccls
* maintMakefile: Don't search hidden directories for sources