Log Message:
Update to libxkbfile-1.0.6. Changes:

s/_XkbDupString/strdup/
Use flockfile if available.
Semi-revert 33b839e16fe681ba915658f824ceb1b252084ea4
Add README with pointers to mailing list, bugzilla & git repos
Migrate to xorg macros 1.3 & XORG_DEFAULT_OPTIONS
libxkbfile 1.0.6
Apply partial matches for option (#19563)
Fix static buffer overflow in "xkbcomp -C :0"
Janitor: distcheck, compiler warnings, .gitignore.