Patch for Bug 26283: float.h is missing mandatory C11 fp macros like DBL_DECIMAL_DIG and LDBL_DECIMAL_DIG

[Jorge Teixeira via cfe-commits]

Hi, I filed the bug (https://llvm.org/bugs/show_bug.cgi?id=26283) some
time ago and nobody picked it up, so here is a trivial patch exposing
the missing macros, that to the best of my ability were already
present as the internal underscored versions.

Perhaps a more general bug about C11 floating point (lack of)
conformance should be filed, so that some form of unit test/macro
validation could be worked on, but this patch does scratch my current
itch.

Successfully tested on x86-64 Xubuntu 14.04 with clang 3.8 from the
ppa, patched with the attached diff.

First contribution, so feel free to suggest improvements or point to
more detailed step-by-step instructions/guidelines.

Cheers,

JT
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