xmh-1.0.4-bp156.1.5

- Update to release 1.0.4
  * Update README for gitlab migration
  * Update configure.ac bug URL for gitlab migration
  * Fix spelling/wording issues
  * Trim trailing whitespace from lines
  * gitlab CI: add a basic build test
  * unifdef -UUSG
  * unifdef -USYSV
  * unifdef -UDGUX
  * Convert vfork checks from Imake-style to autoconf-style

- Update to release 1.0.3:
  * This version continues the tradition of only releasing once every
    5 years, with the latest set of build configuration &
    documentation improvements.

- Split xmh from xorg-x11. Initial version: 1.0.2.