gstreamer: add dependency on xz for head build

autopoint requires xz.

Closes #34160.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Modified crosstool-ng to support compiling with grep
Updated --with-grep description, added option to compile with GNU make
crosstool-ng: patch to use regex compatible with BSD grep
crosstool-ng: update to 1.20
crosstool-ng: updated regex patch
crosstool-ng: removed embedded patches, pointed to submitted patches upstream
crosstool-ng: remove optional dep comments
crosstool-ng: Added URLs to upstream patches in comments.
crosstool-ng: add 1.20.0 bottle.