tests: avoid spurious failures in cross-compile mode

tests: avoid spurious failures in cross-compile mode

* tests/depcomp2.test: Ensure verbose printing of captured stderr
from configure.
* tests/ansi3.test ($required): Add 'native', as the ansi2knr
functionality is not meant to work with a cross-compiler.
* tests/ansi3b.test: Likewise.
* tests/ansi5.test: Likewise.
* tests/ansi6.test: Likewise.
* tests/ansi7.test: Likewise.
* tests/ansi8.test: Likewise.
* tests/ansi10.test: Likewise.
* tests/subobj3.test: Likewise.
* tests/check8.test ($required): Add 'native', as this test is
not meant to work with a cross-compiler.
* tests/gnits2.test: Likewise.
* tests/ltconv.test: Likewise.
* tests/ltcond2.test: Likewise.
* tests/parallel-tests5.test: Likewise.
* tests/specflg7.test: Likewise.
* tests/specflg8.test: Likewise.
* tests/check5.test: Likewise.  Also, ensure verbose printing of
captured make output, and thrown in few cosmetic and consistency
improvements.
* tests/ltinit.test: Be laxer in grepping configure output, to
avoid spurious failures on systems which lack POSIX dynamic
linking (e.g., MinGW), or when cross-compiling for such systems.
* tests/ansi9.test: Skip parts of the test that would require a
native compiler.
* tests/backcompat6.test: Likewise.
* tests/depcomp8a.test: Likewise.
* tests/pr401.test: Likewise.
* tests/pr401b.test: Likewise.
* tests/pr401c.test: Likewise.
* tests/target-cflags.test: Likewise.
* tests/lex3.test: Likewise.
* tests/yacc-basic.test: Likewise.
* tests/autohdr4.test: Likewise.  Also, extend the test to ensure
more coverage in cross-compile mode.
* tests/canon7.test: Likewise.
* tests/check9.test: Removed, split into two new tests ...
* tests/check-subst-prog.test: ... this one, which requires a
native C compiler ...
* tests/check-subst.test: ... and this one, which doesn't require
any compiler.
* tests/parallel-tests4.test: Removed, split into two new tests ...
* tests/parallel-tests-suffix-prog.test: ... this one, which
requires a native C compiler ...
* tests/parallel-tests-suffix.test: ... and this one, which
doesn't require any compiler.
* tests/parallel-tests7.test: Removed, split into two new tests ...
* tests/parallel-tests-ext-driver-prog.test: ... this one, which
requires a native C compiler ...
* tests/parallel-tests-ext-driver.test: ... and this one, which
doesn't require any compiler.
* tests/Makefile.am (TESTS): Update.