Remove sysdeps/sh/soft-fp directory.

As per <https://sourceware.org/ml/libc-alpha/2014-10/msg00369.html>,
there should not be separate sysdeps/<arch>/soft-fp directories when
those are used by all configurations that use sysdeps/<arch>, and,
more generally, should not be sysdeps/foo/Implies files pointing to a
subdirectory foo/bar.  This patch eliminates the sysdeps/sh/soft-fp
directory accordingly, merging its contents into sysdeps/sh.

Tested with build-many-glibcs.py that installed stripped shared
libraries for sh configurations are unchanged by this patch.

	* sysdeps/sh/Implies: Remove sh/soft-fp.
	* sysdeps/sh/soft-fp/sfp-machine.h: Move to ....
	* sysdeps/sh/sfp-machine.h: ... here.

ChangeLog

@@ -1,3 +1,9 @@
+2018-05-23  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/sh/Implies: Remove sh/soft-fp.
+	* sysdeps/sh/soft-fp/sfp-machine.h: Move to ....
+	* sysdeps/sh/sfp-machine.h: ... here.
+
 2018-05-23  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S

sysdeps/sh/Implies

@@ -1,4 +1,3 @@
-sh/soft-fp
 wordsize-32
 ieee754/flt-32
 ieee754/dbl-64