ar incorrectly parses path names with ~ in them, breaks builds of ~rc prerelease packages

Binary package hint: binutils

The latest u-boot-linaro upload failed to build because trying to pass .a pathnames to 'ar -M' fails:

(echo create /build/buildd/u-boot-linaro-2010.09~rc1.1/debian/build/omap4_panda/post/libpost.a; for lib in ; \
  do echo addlib $lib; done; echo save) \
 | ar -M
~Syntax error in archive script, line 1

The full build log is at <http://launchpadlibrarian.net/55788360/buildlog_ubuntu-maverick-armel.u-boot-linaro_2010.09~rc1.1-0ubuntu2_FAILEDTOBUILD.txt.gz> (at least until this bug is fixed and the build is retried).

The failure is due to '~' in the source package directory name. This is a legal character, and dpkg-dev means it to be there, so I think we need to fix ar to accept this pathname.

I don't know if this is a recent regression, or how many other packages might FTBFS because of this behavior.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: binutils 2.20.51.20100908-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
Uname: Linux 2.6.35-20-generic x86_64
Architecture: amd64
Date: Fri Sep 17 10:26:24 2010
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: binutils