Fix passing -j NNN to gmake

Use a more restrictive pattern to extract -j NNN from MAKEFLAGS
into GMAKE_J_ARGS, to avoid false positives when the source directory
has "-j" in the path (e.g "amd64-job

Fix passing -j NNN to gmake

Use a more restrictive pattern to extract -j NNN from MAKEFLAGS
into GMAKE_J_ARGS, to avoid false positives when the source directory
has "-j" in the path (e.g "amd64-job-000012" or "src-j9999").
Previously this could pass either -"-j" or "-j BIGNUM" to gmake
and result in "vfork: Resource temporarily unavailable" failures.

PR misc/54456

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PR bin/55411 (Akihiko HAYASHI)

Remove stray ``&&'' introduced in the previous revision, so that
host tools are correctly passed to configure script.

No similar problem for gcc.old. No release branc

PR bin/55411 (Akihiko HAYASHI)

Remove stray ``&&'' introduced in the previous revision, so that
host tools are correctly passed to configure script.

No similar problem for gcc.old. No release branches are affected.

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duplicate a some of Makefile.gnuhost.

should fix PR#53561.

Honor HOST_CXX.

Disable iconv in host-libcpp autoconf: fixes build on Mac OS X.
Thanks to joerg@ for the diagnosis and proposed fix.

build a host version of libcpp, same as we do for libiberty.
the new genmatch generator program needs libcpp.