Bump required version of texinfo to 4.7

It seems we require texinfo 4.7 for the --plaintext option, so
document that and check for the correct version in configure.

ChangeLog:

2014-12-15  Will Newton  <will.newton@linaro.org>

	* manual/install.texi: Bump required version of texinfo
	to 4.7 from 4.5.
	* INSTALL: Regenerated.
	* configure.ac: Check for makeinfo version 4.7 and above.
	* configure: Regenerated.

ChangeLog

@@ -1,3 +1,11 @@
+2014-12-15  Will Newton  <will.newton@linaro.org>
+
+	* manual/install.texi: Bump required version of texinfo
+	to 4.7 from 4.5.
+	* INSTALL: Regenerated.
+	* configure.ac: Check for makeinfo version 4.7 and above.
+	* configure: Regenerated.
+
 2014-12-12  Roland McGrath  <roland@hack.frob.com>
 
 	* sysdeps/posix/shm-directory.h (SHM_GET_NAME): Take new argument

INSTALL

@@ -356,7 +356,7 @@ build the GNU C Library:
      No other assembler or linker has the necessary functionality at the
      moment.
 
-   * GNU `texinfo' 4.5 or later
+   * GNU `texinfo' 4.7 or later
 
      To correctly translate and install the Texinfo documentation you
      need this version of the `texinfo' package.  Earlier versions do

configure

@@ -4789,7 +4789,7 @@ $as_echo_n "checking version of $MAKEINFO... " >&6; }
   ac_prog_version=`$MAKEINFO --version 2>&1 | sed -n 's/^.*GNU texinfo.* \([0-9][0-9.]*\).*$/\1/p'`
   case $ac_prog_version in
     '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
-    4.[5-9]*|4.[1-9][0-9]*|[5-9].*)
+    4.[7-9]*|4.[1-9][0-9]*|[5-9].*)
        ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
     *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
 

configure.ac

@@ -929,7 +929,7 @@ AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
   MSGFMT=: aux_missing="$aux_missing msgfmt")
 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
   [GNU texinfo.* \([0-9][0-9.]*\)],
-  [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
+  [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 AC_CHECK_PROG_VER(SED, sed, --version,
   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],

manual/install.texi

@@ -400,7 +400,7 @@ No other assembler or linker has the necessary functionality at the
 moment.
 
 @item
-GNU @code{texinfo} 4.5 or later
+GNU @code{texinfo} 4.7 or later
 
 To correctly translate and install the Texinfo documentation you need
 this version of the @code{texinfo} package.  Earlier versions do not