scripts/finish: do not try to symlink if sed expr is a no-op

If the sed expression does not transform the
tuple, do not try to create the symlink.
(transplanted from 5d6d3c28a658a65551d4eb5de414fd97b575f314)

scripts/finish: do not try to symlink if sed expr is a no-op

If the sed expression does not transform the
tuple, do not try to create the symlink.

debug/gdb: fix incorrect path

Fix discrepancy between the directory we create,
and the directory into which we install tic.

libc/glibc: fix installed scripts

glibc installs some bash-scripts, but uses the path to the buildtool
bash as interpreter (on the shebang line). This is only a symlink to
the real bash, and thus is not available at runtime.

Fix that by assuming that bash on the target *will* be /bin/bash.

1.7: update version to 1.7.1+hg

Tagging release 1.7.1

1.7: update version to 1.7.1

scripts/wrapper: fix wrong test when checking access to the reall tool

In C, the proper syntax for a bit-wise OR is a single '|', not two.

It worked so far because all was well:
- X_OK == 1
- R_OK||X_OK == 1
- the file we searched for had the x-bit set
-> access( file, R_OK||X_OK ) worked
- inicidentally, the file we searched for also had the r-bit set,
but we were not testing that in fact.
(transplanted from eebcaff6626f09af4f69b7b06f1246a06769d0af)

complibs/gmp: 5.0.0 misses 'EXPERIMENTAL' in the prompt
(transplanted from 95b4a458fd60d3e0911750c2b7c1b6cf36285845)

cc/gcc: fix headers copy for core static
(transplanted from 22ce0c19f06a530d72fd65c89d0777d16c0a97ac)