I added new modules 'floor', 'ceil'. Since all systems have these functions and (as far as we know) declare them in <math.h>, all these modules do is to determine whether linking with -lm is necessary or not.
http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=93ac3c97f65305215855750c72024a3745948aaf http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=cf3719f4dcf54ebc3ef884a74c7ed9f80fc2912c Bruno
