Fixed two bugs in MacOSX framework handling spotted by Edward Moy:

Fixed two bugs in MacOSX framework handling spotted by Edward Moy:

- In the top level Makefile, the argument to -install_name should be
  prepended with /System/Library/Frameworks/, so it is an absolute path.
- In the top level Makefile, because of 2), RUNSHARED needs to be set to
  DYLD_FRAMEWORK_PATH=<path to local framework> and $(RUNSHARED) prepended
  to the $(MAKE) lines in the frameworkinstallmaclib and
  frameworkinstallapps targets.