Log Message:
Various fixes:
* Remove copy of X11 header files for old X11,
  it may cause build failure with recent X, like a PR 39975.
* Need rgb.txt, add dependency on x11/rgb for X11_TYPE=modular.
  And fix path for the file (SUBST.rgb and patch-ac).
* Add DESTDIR support. it seems that rules of imake deal spaces after cammna
  as part of the argument (patch-ac).
* Replace IMAKE_MANNEWSUFFIX with  IMAKE_MAN_SUFFIX in PLIST.
* hard coded errno and sys_errlist is not portable these days (patch-ab)
* sort PLIST
* regen patches with unfied diff.

Bump PKGREVISION.