#125 ld_tools enhancements for gnulib

[John Malmberg]

Some enhancements that would help with the gnulib port and testing.

1. Gnulib configure is testing cc -version and cc -qversion

2. Gnulib tests are creating over 1000 test binaries, which all need an option file for VMS supplimental libraries. Creating a gnv$<name>.opt for each one is not practical as binary names could change over time and there is no good way to predict which ones are needed.</name>

Need to have LD check for a $GNV_OPT_DIR\gnv$link_options.opt file and use it if it does not find the gnv$<name>.opt</name>