packages: Remove glibc svn revision

Was left over from EGLIBC
packages: Reorder for glibc alphabetical
linux-headers: Match description to location

Due to recent change of installing linux-headers to ${CLFS}/cross-tools
the description at the bottom of the page needed updating to match.
binutils: Don't copy libiberty.h

It's not needed, especially not in the final system.  GCC will setup its
own version, anyway.
glibc: Add CFLAGS and --{,exec-}prefix=

CFLAGS are needed to optimize for size.  With -Os resulting ${CLFS}/lib
is 15 MB, with default -O2 -g resulting ${CLFS}/lib is 48 MB on arm.  15
MB is huge, let alone 48 MB!

--exec-prefix= sets the location of the resulting libs.  We want this on
the target.
--prefix= sets the location of the headers, we want this in
${CLFS}/cross-tools as just the compiler needs them.