V3 PATCH: library fallback for mathematical __builtin_xxx

[Gabriel Dos Reis]

This patch implements the stubs for missing functions required for V3
in <math.h>.  It should fix PR 3474. 

Bootstrapped and tested on an i686-pc-linux.  Applied to mainline 
only -- branch will go through the same treatment after a day or two.

-- Gaby

2001-07-25  Gabriel Dos Reis  <gdr@merlin.codesourcery.com>

	* acinclude.m4: CHECK_MATH_DECL_AND_LINKAGE for hypot, hypotf,
	hypotl, atan2f, atan2l.  Remove from REPLACE_MATHFUNCS list.
	* aclocal.m4: Regenerate.
	* config.h.in: Likewise.
	* configure: Likewise.
	* libmath/Makefile.am (EXTRA_LONG_DOUBLE_yes): Remove hypotl.c
	(EXTRA_DIST): Remove hypot.c hypotf.c.
	* libmath/Makefile.am: Regenerate.
	* libmath/hypotf.c: Remove.
	* libmath/hypot.c: Likewise.
	* libmath/hypotl.c: Likewise.
	* libmath/stubs.c: The macros seen here are HAVE_xxx, not
	_GLIBCPP_HAVE_xxx.  Add long double versions.

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