Link with mtmalloc on Solaris as it is done in our release builds.
Replace deprecated flag with the newer option as already done in
other scripts.

BUILD/compile-solaris-amd64-forte:
  Link to mtmalloc and replace deprecated flag.
BUILD/compile-solaris-amd64-forte-debug:
  Replace deprecated flag.
BUILD/compile-solaris-sparc:
  Link to mtmalloc.
BUILD/compile-solaris-sparc-forte:
  Link to mtmalloc