o Move code to determine objdir into determine_objdir().

   o Move code to determine objdir into determine_objdir().
       o Move curdir, and objdir out of global scope.
       o Clean up ReadMakefile()
               + put enough code into the #ifdef #endif section to
                 be a complete statement.
               + renamed var 'p' to file and elimiate as many uses of
                 strdup() copy as possible.  The strup() is a hack.
               + Eliminate goto by inlining the destination code.  Trust
                 the compiler to do its job.
               + inline setMAKEFILE.
               + Moved common code out of #ifdef sections.