sim: common: split up acinclude.m4 into individual m4 files

This file is quite large and is getting unmanageable.  Split it apart
to follow aclocal best practices by putting one-macro-per-file.  There
shouldn't be any real functional changes here as can be seen in the
configure script regens.

sim/m32r/configure

@@ -631,6 +631,9 @@ ac_includes_default="\
 
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+sim_reserved_bits
+sim_float
+sim_bitsize
 cgen_breaks
 sim_extra_cflags
 traps_obj
@@ -752,16 +755,13 @@ PATH_SEPARATOR
 SHELL
 WERROR_CFLAGS
 WARN_CFLAGS
-sim_reserved_bits
+sim_scache
 sim_inline
 sim_hw
 sim_hw_objs
 sim_hw_cflags
-sim_default_model
-sim_scache
-sim_float
 sim_endian
-sim_bitsize
+sim_default_model
 sim_alignment'
 ac_subst_files=''
 ac_user_opts='
@@ -11807,7 +11807,6 @@ _ACEOF
 
 
 
-
 wire_endian="BIG"
 default_endian=""
 # Check whether --enable-sim-endian was given.
@@ -12201,6 +12200,18 @@ ac_config_commands="$ac_config_commands Makefile"
 
 ac_config_commands="$ac_config_commands stamp-h"
 
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 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure