ltconfig used just an empty source file to test the share lib
compiler options. SUNSpro CC returns succeed though it issues
a warning too. ltconfig did not like the warning.
Changed it to test with a file containing a simple dummy program.
Platform tested: solaris 2.6 and 2.7
config/solaris2.x:
Changed default compiler to "cc" now that Sunpro CC can produce
static and shared codes correctly.
Also added -s to PROD_CFLAGS to produce leaner binary files.