[patches] Merge from branches/eglibc-2_5/libc to trunk/libc

[Jim Blandy <jimb@xxxxxxxxxxxxxxxx>]

I've merged the following change from the EGLIBC 2.5 branch to the
EGLIBC trunk:

ChangeLog.eglibc:
2006-12-08  Jim Blandy  <jimb@xxxxxxxxxxxxxxxx>

	Add rudimentary option group support.
	* option-groups.mak, option-groups.def, option-groups.defaults:
       New files.
	* Makerules: Add contents of enabled option groups to the values
	of the variables 'routines', 'others', 'install-bin',
	'install-sbin', 'extra-objs', 'tests', and 'test-srcs'.
	* catgets/Makefile: Add the catgets directory's routines and
	programs to the OPTION_EGLIBC_CATGETS option group.