Log message:
- fine grained X11 dependencies for packages which have either USE_IMAKE
  or USE_X11BASE set, but don't include mk/x11.buildlink3.mk directly or
  via buildlink3.mks
- introduce BUILDLINK_PREFIX.libXpm as alias for BUILDLINK_PREFIX.xpm
  in the !modular case
- fix some cases where the check for libX11 couldn't work at all by using
  C++ for compilation without including the proper headers

Verified using a full X11_TYPE=xorg bulk build without additional
breakage. Discussed with salo@, wiz@ and send to packages@ for feedback.

Log message:
Mechanically replace all includes of buildlink3.mk of the following
packages with the modular Xorg equivalent. Those are falling back
to the old location by default, so this commmit doesn't change
dependencies.

graphics/xpm ==> x11/libXpm
fonts/Xft2 ==> x11/libXft
x11/Xfixes ==> x11/libXfixes
x11/xcursor ==> x11/libXcursor
x11/Xrender ==> x11/libXrender
x11/Xrandr ==> libXrandr

Log message:
Fix typo or mispelling.

Log message:
Recursive revision bump / recommended bump for gettext ABI change.

Log message:
Remove USE_BUILDLINK3 and NO_BUILDLINK; these are no longer used.

Log message:
Add RMD160 checksums to the SHA1 ones.

Log message:
Convert to buildlink3.

Log message:
"It's" stands for "it is" (or "it has").  The \ 
apostrophe is not used
for a possessive (like her, his, whose, their, and its).

Note that I didn't check for proper use of "its" (when it should
be "it is" or "it has" instead).

I also saw over 15 other grammar or punctuation problems, but not
fixed in this commit.

Log message:
COMMENT should start with a capital letter.

Log message:
Drop trailing whitespace.  Ok'ed by wiz.