fribidi support (gentoo icewm-1.3.9-fribidi.patch)

  Also fixes several problems with the gentoo patch:

  1) the patch modifies CORE_CFLAGS and CORE_LIBS before they
     are first defined, confusing later PKG_CONFIG([CORE], ...)
     so I moved it later in configure.ac

  2) the patch uses the deprecated fribidi_log2vis, so I modified
     src/yfontxft.cc to disabled deprecated symbols (because I
     always test build with -Werror).

  3) the patch ignores the return value of fribidi_log2vis()
     causing another warning which -Werror turns into an error.
     Changed to "if (fribidi_log2vis(...)) ;" to disable that.

  4) fixed the configure.ac macro check for fribidi to only warn
     when the library is not present but the feature has not
     been disabled

  5) add fribidi to configure.ac features list shown at end of
     ./configure run (added xrandr and xinerama too...)
Merge branch 'icewm-1-3-BRANCH' of https://github.com/bbidulock/icewm into icewm-1-3-BRANCH