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>

 # newlib second-part options

 config LIBC_NEWLIB_IO_C99FMT

     bool

     prompt "Enable IOs on C99 formats"

     help

       Enable support for IOs on C99 formats.

 config LIBC_NEWLIB_IO_LL

     bool

     prompt "Enable IOs on long long"

     help

       Enable support for IOs on long long integers.

 config LIBC_NEWLIB_IO_FLOAT

     bool

     prompt "Enable IOs on floats and doubles"

     help

       Enable support for IOs on floating point

       values (float and double).

 config LIBC_NEWLIB_IO_LDBL

     bool

     prompt "Enable IOs on long doubles"

     depends on LIBC_NEWLIB_IO_FLOAT

     help

       Enable support for IOs on long doubles.