Revert ld DIGEST support

This is a hopefully temporary reversion of new ld features for
embedded processors by Ulf Samuelsson, plus some followup patches.

Squashed together from the following:

Revert "lddigest 32-bit support and gcc-4 compile errors"
This reverts commit d7ee19be87110a8f5342cec6e323d83d01c641d1.

Revert "ld: Use correct types for crc64 calculations"
This reverts commit 9a534b9f.

Revert "Re: DIGEST: testsuite"
This reverts commit c8e85484.

Revert "Regen potfiles"
This reverts commit 4d98c966.

Revert "DIGEST: Makefile.*"
This reverts commit 78ef6ab0.

Revert "DIGEST: calculation"
This reverts commit 52439901.

Revert "DIGEST: ldlang.*: add timestamp"
This reverts commit bd9466d4.

Revert "DIGEST: ldmain.c"
This reverts commit c8f8653f.

Revert "DIGEST: ldgram.y"
This reverts commit d73c01be.

Revert "DIGEST: ldlex.l"
This reverts commit 48b5163a.

Revert "DIGEST: testsuite"
This reverts commit a4135d1a.

Revert "DIGEST: Documentation"
This reverts commit 3ec28966.

Revert "DIGEST: NEWS"
This reverts commit 099bf292.

Revert "DIGEST: LICENSING"
This reverts commit 5c8a0c66.