glibc: Refactor startfiles/headers into do_libc_backend()

Refactor the contents of 'do_libc_start_files()' and 'do_libc()' into a
parameterized 'do_libc_backend()'. 'do_libc_start_files()' and 'do_libc()'
call 'do_libc_backend()' with either 'libc_mode=startfiles' or
'libc_mode=final' (respectively) so that the startfiles/headers and
the final libc builds are configured and built with the same options.

One example of where this is needed is when building a mips toolchain.
Previously, if you were building an n32 toolchain, you wouldn't have
noticed an issue, because if '-mabi' is not in CFLAGS, n32 is the
default:

http://sourceware.org/git/?p=glibc-ports.git;a=blob;f=sysdeps/mips/preconfigure;hb=HEAD

But when trying to build an o32 or n64 toolchain the build would
have failed. This is because (e)glibc expects "-mabi={o32,n32,n64}" to be
in CFLAGS, but was not previously provided in 'do_libc_start_files()'.
The build failure would happen in the shared-core gcc when it tries to
configure an n64 or o32 gcc with an n32 libc.

A simpler solution would have been to just add TARGET_CFLAGS to configure
in 'do_libc_start_files()', but this way makes configure and make
consistent for both steps.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>

This is a somewhat ordered TODO list:

Recuring tasks:

- update versions for every tools...

- update and/or upgrade all samples

Non-recurring tasks:

- update newlib (for enhanced bare metal)

  - confirm existing implementation on targets other than AVR32

  - try to make it generic, will help for uClibc++

- multilib

- Cygwin target (needs newlib)

  - so we can build toolchains that generate code for Windows/Cygwin

- Cygwin host

  - so we can build toolchains that run natively under Windows/Cygwin

- mingw32 target

  - so we can build toolchains that generate code for Windows/Win32

- mingw32 host

  - so we can build toolchains that run natively under Windows/Win32

    (without requiring Cygwin)

- uClibc++

  - see newlib, above

- uClinux

  - check whether we can use newlib under uClinux (?)