In link_c(), extra object files were mistakenly being treated as
output files, not input files, in the up-to-date check. Fixed.In up_to_date(), don't make an unnecessary copy of the file lists
when they're specified as array references.Split off the C compilation phase into its own method,
compile_support_files(), for easier subclassing.Start a stub of a 'manifypods' action.
Compiler optimizations weren't being included in C compilation
statements. Fixed.The 'extra_linker_flags' parameter wasn't being honored. Fixed.
The 'ccflags' Config.pm entry wasn't being properly split into
separate arguments. Fixed.