[doc] doc/makefile.texi: refer to installation instructions

[Gerald Pfeifer]

This link has _never_ worked, and instead of referring to the copy 
at gcc.gnu.org/install/ referring to the installation instructions
in textual form makes sense.  (They are part of release tarballs, 
for example.)

Applied.

Gerald

2017-02-10  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/makefile.texi (profiledbootstrap): Refer to the
	installation instructions only in textual form.

Index: doc/makefile.texi
===================================================================
--- doc/makefile.texi	(revision 245347)
+++ doc/makefile.texi	(working copy)
@@ -138,8 +138,7 @@
 @item profiledbootstrap
 Builds a compiler with profiling feedback information.  In this case,
 the second and third stages are named @samp{profile} and @samp{feedback},
-respectively.  For more information, see
-@ref{Building,,Building with profile feedback,gccinstall,Installing GCC}.
+respectively.  For more information, see the installation instructions.
 
 @item restrap
 Restart a bootstrap, so that everything that was not built with