+ improved manual page description of tset/reset versus window-size.
+ fixes to work with a slightly broken compiler configuration which
cannot compile "Hello World!" without adding compiler options
(report by Ola x Nilsson):
+ pass appropriate compiler options to the CF_PROG_CC_C_O macro.
+ when separating compiler and options in CF_CC_ENV_FLAGS, ensure
that all options are split-off into CFLAGS or CPPFLAGS
+ restore some -I options removed in
20140726 because they appeared
to be redundant. In fact, they are needed for a compiler that
cannot combine -c and -o options.