Cleaned up pthread options to fix 64-bit build on Solaris x86.  Cleaned up old 64-bit defines and removed unnecessary 32-bit build options.
Cleaned up pthread options to fix 64-bit build on Solaris x86.  Cleaned up old 64-bit defines and removed unnecessary 32-bit build options.

apache/xalan-c,apache/xalan-c,apache/xalan-c,apache/xalan-c