(main): Use gdImageCreateTrueColor and gdImageAlphaBlending only if HAVE_GD is 2 or the greater.
(main): Use gdImageCreateTrueColor and
gdImageAlphaBlending only if HAVE_GD is 2 or the greater.

xmirror/m17n-lib,xmirror/m17n-lib,xmirror/m17n-lib,xmirror/m17n-lib