Update SPARC divrem generation to match output.

While working on another patch I noticed that (a)
sysdeps/sparc/sparc32/Makefile is the only place with special
realclean settings, apart from po/, and (b) the generated files with a
rule in that Makefile to generate them (using m4) had been patched
manually so no longer corresponded with the output of the generator -
so if the timestamps were wrong, a build would result in changes to
the files in the source directory.  (They also didn't correspond
because of changes in make 3.81 to how make handles whitespace at the
start of a line in a sequence of backslash-newline continuation lines
within a recipe.)

This patch fixes the generation and output files to match.  The issue
with make and whitespace at start of continuation lines is fixed by
putting those newlines outside of arguments to echo, so the number of
spaces in the argument matches the number in the existing generated
files.  Then divrem.m4 is changed to avoid generating whitespace-only
lines (my fix to the outputs from 2013; this fix to the generator also
changes the indentation of a label in the output files) and to
generate an alias in udiv.S (Adhemerval's fix from March).

build-many-glibcs.py doesn't have a non-v9 SPARC configuration,
because non-v9 32-bit SPARC didn't build when I set up
build-many-glibcs.py but sparcv9 did build.  Whether or not non-v9
32-bit SPARC now builds (or indeed whether or not support for it is
obsolete), I tested by removing the sparcv8 and sparcv9 versions of
the four files in question, so forcing the generated files to be built
and used, and the compilation parts of the glibc testsuite passed.

	* sysdeps/sparc/sparc32/Makefile
	($(divrem:%=$(sysdep_dir)/sparc/sparc32/%.S)): Do not include
	start-of-line whitespace in argument of echo.
	* sysdeps/sparc/sparc32/divrem.m4: Avoid generating lines starting
	with whitespace.  Generate __wrap_.udiv alias.
	* sysdeps/sparc/sparc32/rem.S: Regenerated.
	* sysdeps/sparc/sparc32/sdiv.S: Likewise.
	* sysdeps/sparc/sparc32/udiv.S: Likewise.
	* sysdeps/sparc/sparc32/urem.S: Likewise.

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