Update configure.ac for autotools 2.71 and fix compile errors from
GCC 11.

	* configure.ac: Remove AC_PROG_LIBTOOL.

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* src/Makefile.in: regenerate.

	* src/pveclib/vec_int128_ppc.h (vec_sraq): Cast from
	vec_setb_sq() to (vui128_t).
	(vec_sraqi): Cast from vec_setb_sq() to (vui128_t).
	* src/testsuite/vec_int128_dummy.c (test_setb_cyq,
	test_setb_ncq, test_setb_sq): Change type of function result to
	vb128_t.
	* src/testsuite/vec_perf_f64.c (timed_fpclassify_f64):
	Change type of accum to vui64_t.

Signed-off-by: Steven Munroe <munroesj52@gmail.com>

The switch to GCC-12 exposed some latent issues in pveclib-1.0.4-4
1) The (accidental) typedef of __float128 over __ieee128 and the cast
of (vector unsigned int *) constants to (vector unsigned __int128 *)
seems to violate strict-aliasing. But this is not reported unless
-Wstrict-aliasing=2 is used. The result was silently generating
incorrect code. GCC PR 106755.
2) GCC-12 corrected a long latent problem with vec_cpsgn
(swapped operands). PVECLIB followed the implementation from
previous GCC versions (GCC <= 11). This broke vector float/double
unit tests. GCC PR 101984.
3) The implementation of IEEE Float128 is evolving and various types
(__float128, __ieee128, _Float128, ...) are highly dependent on the
compiler version/options used. The implementation (tries again) to
supports. The API uses __binary128 and avoids _Float128.

	* src/pveclib/vec_f128_ppc.h (__binary128): Define/typedef to
	the quad-precision float type that the support supports.

	* src/pveclib/vec_f32_ppc.h (vec_copysignf32):
	Unless PVECLIB_CPSGN_FIXED is defined, avoid vec_cpsgn.
	* src/pveclib/vec_f64_ppc.h (vec_copysignf64):
	Unless PVECLIB_CPSGN_FIXED is defined, avoid vec_cpsgn.

	* src/testsuite/arith128_test_f32.c (test_float_cpsgn):
	Swap operands/results to match GCC12.
	* src/testsuite/arith128_test_f64.c (test_double_cpsgn):
	Swap operands/results to match GCC12.

	* src/testsuite/arith128_test_i128.c (test_muludq):
	Change local variable 'l' type to match vec_muludq parameter.
	(test_madduq)
	Change local variable 'l' type to match vec_madduq parameter.

	* src/testsuite/vec_f128_dummy.c: Replace all usage of type
	__Float128 with __binary128.

Signed-off-by: Steven Munroe <munroesj52@gmail.com>