This is update for configure, build and install of vector math library.

Installation of libm.so as linker script only in case of libmvec.so build.

2015-05-14  Andrew Senkevich  <andrew.n.senkevich@gmail.com>

    * Makeconfig (rpath-dirs, all-subdirs): Added mathvec folder.
    (libmvec): New variable.
    * configure.ac: Added option for mathvec build.
    * configure: Regenerated.
    * mathvec/Depend: New file.
    * mathvec/Makefile: New file.
    * shlib-versions: Added libmvec.
    * math/Makefile: Added rule for libm.so installation.

mathvec/Depend

@@ -0,0 +1 @@
+math

mathvec/Makefile

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+# Copyright (C) 2014-2015 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# Makefile for the vector math library.
+
+subdir		:= mathvec
+
+include ../Makeconfig
+
+ifeq ($(build-mathvec),yes)
+extra-libs	:= libmvec
+extra-libs-others = $(extra-libs)
+
+libmvec-routines = $(strip $(libmvec-support))
+
+$(objpfx)libmvec.so: $(libm)
+endif
+
+# Rules for the test suite are in math directory.
+
+include ../Rules