Allow user to add a directory component in the sys-root path.
Rename CT_DEBUG_INSTALL_DIR to CT_DEBUGROOT_DIR (to match CT_SYSROOT_DIR).
As a side effect, fix creating lib64->lib symlinks.

/trunk/scripts/build/debug/100-dmalloc.sh | 2 1 1 0 +-
/trunk/scripts/build/debug/400-ltrace.sh | 2 1 1 0 +-
/trunk/scripts/build/debug/300-gdb.sh | 6 3 3 0 +++---
/trunk/scripts/build/debug/500-strace.sh | 2 1 1 0 +-
/trunk/scripts/build/debug/200-duma.sh | 6 3 3 0 +++---
/trunk/scripts/crosstool-NG.sh.in | 16 7 9 0 +++++++---------
/trunk/scripts/functions | 2 1 1 0 +-
/trunk/config/toolchain.in | 17 17 0 0 +++++++++++++++++
8 files changed, 34 insertions(+), 19 deletions(-)

See http://gcc.gnu.org/PR3106

Backported from gcc-3.0.x

Fixes error

  .../binutils-2.11.2/libiberty/strerror.c:468: error: conflicting types for `sys_nerr'

  /usr/include/stdio.h:258: error: previous declaration of `sys_nerr'

  make[1]: *** [strerror.o] Error 1

  make: *** [all-libiberty] Error 2

on Mac OS X.

--- gcc-2.95.3/libiberty/strerror.c.old	2004-03-24 16:23:19.000000000 -0800

+++ gcc-2.95.3/libiberty/strerror.c	2004-03-24 16:23:48.000000000 -0800

@@ -13,6 +13,7 @@

    incompatible with our later declaration, perhaps by using const

    attributes.  So we hide the declaration in errno.h (if any) using a

    macro. */

+#define sys_nerr sys_nerr__

 #define sys_errlist sys_errlist__

 #endif

@@ -20,6 +21,7 @@

 #include <errno.h>

 #ifdef HAVE_SYS_ERRLIST

+#undef sys_nerr

 #undef sys_errlist

 #endif