perl 5.003_05: Configure

perl 5.003_05: Configure

Allow command line or hint-file overrides of $afs.

Allow trailing spaces in nm output for HPUX10.

Check for newer BIND 'search' directives in /etc/resolv.conf as well
as older 'domain' directive.

Enhance detection of [gs]etpgrp() variants.  Some systems have
BSD-style behavior for one and POSIX for the other.  Use
[gs]etpgid() instead, whenever possible.

Include -s in the -h summary of available options.

Allow command-line override of $afs.

Handle trailing spaces in nm-output on HPUX10.

Set shrpenv for handling LD_RUN_PATH, if needed. (This used to
be in Makefile.SH.  Now it's available for other modules too.)

When using shared libperl, avoid LD_RUN_PATH if possible by adding
correct ld flags.  Currently, Solaris and NetBSD get the correct
-R $archlibexp/CORE, and Linux gets its
-Wl,-rpath,$archlibexp/CORE flag.  Other contributions are
welcome.