[PATCH build/doc] Replacing libiberty with gnulib

[ayush goel]

Updating the patch, contains only changes to the documentation.


PFA the patch





2016-08-22 Ayush Goel <ayushgoel1610@gmail.com>

* Makefile.def: Added gnulib as build & host library and dependency of
all-gcc on gnulib
* Makefile.in: regenerated
* configure.ac: Added gnulib as build and host library
* configure: regenerated
* gcc/Makefile.in: Added path to gnulib static library (libgnu.a) and
gnulib header files
* gcc/mkconfig.sh: Included gnulib’s config.h
* gcc/doc/sourcebuild.texi: Added gnulib and how to use the update
script to update/import gnu lib modules
* gnulib: created directory
* gnulib/Makefile.in: new file
* gnulib/configure.ac: new file
* gnulib/update-gnulib.sh: script to import gnulib modules using gnulib-tool
* gnulib/import: created by update-gnulib.sh
* gnulib/import/Makefile.in: imported from gnulib
* gnulib/import/alignof.h: Imported from gnulib
* gnulib/import/exitfail.c: Imported from gnulib
* gnulib/import/exitfail.h: Imported from gnulib
* gnulib/import/extra: Imported from gnulib
* gnulib/import/extra/snippet: Imported from gnulib
* gnulib/import/extra/snippet/_Noreturn.h: Imported from gnulib
* gnulib/import/extra/snippet/arg-nonnull.h: Imported from gnulib
* gnulib/import/extra/snippet/c++defs.h: Imported from gnulib
* gnulib/import/extra/snippet/warn-on-use.h: Imported from gnulib
* gnulib/import/gettext.h: Imported from gnulib
* gnulib/import/m4: Imported from gnulib
* gnulib/import/m4/00gnulib.m4: Imported from gnulib
* gnulib/import/m4/absolute-header.m4: Imported from gnulib
* gnulib/import/m4/extern-inline.m4: Imported from gnulib
* gnulib/import/m4/gnulib-cache.m4: Imported from gnulib
* gnulib/import/m4/gnulib-common.m4: Imported from gnulib
* gnulib/import/m4/gnulib-comp.m4: Imported from gnulib
* gnulib/import/m4/gnulib-tool.m4: Imported from gnulib
* gnulib/import/m4/include_next.m4: Imported from gnulib
* gnulib/import/m4/longlong.m4: Imported from gnulib
* gnulib/import/m4/multiarch.m4: Imported from gnulib
* gnulib/import/m4/obstack.m4: Imported from gnulib
* gnulib/import/m4/off_t.m4: Imported from gnulib
* gnulib/import/m4/ssize_t.m4: Imported from gnulib
* gnulib/import/m4/stddef_h.m4: Imported from gnulib
* gnulib/import/m4/stdint.m4: Imported from gnulib
* gnulib/import/m4/stdlib_h.m4: Imported from gnulib
* gnulib/import/m4/sys_types_h.m4: Imported from gnulib
* gnulib/import/m4/unistd_h.m4: Imported from gnulib
* gnulib/import/m4/warn-on-use.m4: Imported from gnulib
* gnulib/import/m4/wchar_t.m4: Imported from gnulib
* gnulib/import/obstack.c: Imported from gnulib
* gnulib/import/obstack.h: Imported from gnulib
* gnulib/import/stddef.in.h: Imported from gnulib
* gnulib/import/stdint.in.h: Imported from gnulib
* gnulib/import/stdlib.in.h: Imported from gnulib
* gnulib/import/sys: Imported from gnulib
* gnulib/import/sys_types.in.h: Imported from gnulib
* gnulib/import/unistd.c: Imported from gnulib
* gnulib/import/unistd.in.h: Imported from gnulib
* gnulib/stamp-h1: generated

-Ayush
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