Remove mention of uClibc, replace with "C library"

In prep for removal of uClibc.
arm/abi: Reduce table to 2 columns

Columns 1 and 2 were the same and thus duplicate information that is not
needed and may even confuse.  Remove column 2.
binutils & mpfr: Remove --enable-shared

Not needed.
arm/abi: Remove all ABI except EABI

OABI is obsolete as of GCC 4.7.
arm/uclibc: Use common uclibc text

As ARM is not just aapcs-linux and EABI there's no need for the OABI to
EABI sed line and the common uclibc steps apply.
uClibc-configs.patch: Remove OABI, use EABI

Default big and little endian configs are now EABI only.
Rename uClibc-configs from 2 to 3 for OABI->EABI
arm/changelog: Removal of OABI
general: Update date
arm: Remove archs that aren't armv{4,5,6,7}

EABI supports armv4t and newer.
gcc-static: Do mpfr, gmp, and mpc, too

Remove MPFR, GMP, and MPC steps.  Place each into GCC static build
directory as that's an alternate method and reduces the number of steps.
gcc-final: Do mpfr, gmp, and mpc, too

Due to removal of MPFR, GMP, and MPC steps now gcc-final needs to unpack
them, too.
audience: Remove big CLFS bits

This is embedded, 10 MB root fs should be easy.
hostreqs: Upcase GCC name
resources: Remove LFS-references broken link
Move mkdir build-dir to materials

There was only 1 page for creating the build dir as it used to be
creating a partition (which isn't needed for embedded) but it fits
better within materials as that's where ${CLFS}/cross-tools/sources gets
created anyway.  Let's keep it all together.
Retitle ch2 to include build dir creation
materials: Move sources dir create with ${CLFS}

So that ${CLFS} and ${CLFS}/sources are created together.
materials: remove arch specific packages & patches

The core build does not currently have any arch specific patches or
packages and shouldn't.

Core packages and patches are the same for each arch and should only
consist of:
* gcc
* binutils
* libc
* linux
* busybox or similar

Beyond that and it's into the beyond sections.
materials: Make everything common

Further make the materials section fully common.