Log Message:
Updated Gauche package to latest release, 0.7.4.2.

Many changes were made from previous packaged version, 0.6.3;  Lots of
improvements and bug fixes, including security ones.  Please take a look
at its WWW page for more detailes.

http://www.shiro.dreamhost.com/scheme/gauche/

pkgsrc changes:

- support buildlink2.  buildlink3.mk is also added but not tested since
  I have not moved to buildlink3 environment yet.

- this package now uses libgcudevel/boehm-gc instead of self contained,
  slightly modified one.  It seems that this package runs under m68k.