Add support for the GCC binary integer constants extension.

From Joerg Wunsch in GCC PR 23479, under the GPLv2.
This is required to build the i965 backend with newer versions of mesa.

ok kettenis@

Add support for the GCC binary integer constants extension.

From Joerg Wunsch in GCC PR 23479, under the GPLv2.
This is required to build the i965 backend with newer versions of mesa.

ok kettenis@ espie@ miod@

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Add support for "d" floating-point suffix, as defined by draft N1312
of TR 24732. Emit pedantic warning if the feature is being used.
Requested by jasper@; needed by certain ports. OK miod@.

import of gcc-4.2.1, the last gcc release under GPLv2