[CWEB] Release 4.8.

This new release provides the following features:

* @<Code sections@> can be used freely in any #if -- #elif -- #else --
  #endif preprocessor branches without bashing the debugger

* The GCC compiler can be invoked with option -Wimplicit-fallthrough=2
  on all CWEB code modules and will acknowledge /* fall through */
  comments in the tangled C code

* Simple C casts like '(double)x' are formatted with non-breaking small
  spaces as '(double)\,x' in the woven TeX output

* The HINT boolean macros are now in lowercase (as in ifhint.tex)

* Comma-separated lists of variable declarations are formatted in
  accordance with function parameter lists and enumerations, i.e.,
  comma is handled in math-mode with associated small spacing

and it fixes these bugs:

* Section @<Preprocessor definitions@> isn't overprinted (in PDF)

* Trivial CWEB code is formatted correctly (issue #36)

* Nested type definitions are recognized (issue #34)

Major remaining bug (as of CWEB 4.3.1):

* Issue #38 as described earlier

git-svn-id: svn://tug.org/texlive/trunk@63490 c570f23f-e606-0410-a88d-b1316a301751

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