Update build system to find moved scripts -- Step 3 of 2:

- Update references from using PKGLIBDIR to PKGDATADIR.
- Update built-in script search paths to reflect new install location:
  - $(pkgdatadir)       =>   $(pktdatadir)/site
  - $(pkglibdir)        =>   $(pktdatadir)/scripts
- Update installed location of httpd files:
  - $(pkglibdir)/httpd   =>   $(pkgdatadir)/httpd


git-svn-id: svn://svn.berlios.de/openocd/trunk@1920 b42882b7-edfa-0310-969c-e2dbd0fdcd60