sim: use AS_HELP_STRING everywhere

This helps standardize the configure --help output.

sim/msp430/ChangeLog

@@ -1,3 +1,7 @@
+2015-06-23  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure: Regenerate.
+
 2015-06-17  Mike Frysinger  <vapier@gentoo.org>
 
 	* msp430-sim.c (maybe_perform_syscall): Replace call to cb_syscall

sim/msp430/configure

@@ -1403,15 +1403,23 @@ Optional Features:
   --disable-libtool-lock  avoid locking (might break parallel builds)
   --enable-maintainer-mode  enable make rules and dependencies not useful
 			  (and sometimes confusing) to the casual installer
-  --enable-sim-bswap			Use Host specific BSWAP instruction.
-  --enable-sim-cflags=opts		Extra CFLAGS for use in building simulator
-  --enable-sim-debug=opts		Enable debugging flags
-  --enable-sim-stdio			Specify whether to use stdio for console input/output.
-  --enable-sim-trace=opts		Enable tracing flags
-  --enable-sim-profile=opts		Enable profiling flags
-  --enable-sim-endian=endian		Specify target byte endian orientation.
-  --enable-sim-alignment=align		Specify strict,  nonstrict or forced alignment of memory accesses.
-  --enable-sim-inline=inlines		Specify which functions should be inlined.
+  --enable-sim-bswap      Use Host specific BSWAP instruction
+  --enable-sim-cflags=opts
+                          Extra CFLAGS for use in building simulator
+  --enable-sim-debug=opts Enable debugging flags (for developers of the sim
+                          itself)
+  --enable-sim-stdio      Specify whether to use stdio for console
+                          input/output
+  --enable-sim-trace=opts Enable tracing of simulated programs
+  --enable-sim-profile=opts
+                          Enable profiling flags
+  --enable-sim-endian=endian
+                          Specify target byte endian orientation
+  --enable-sim-alignment=align
+                          Specify strict, nonstrict or forced alignment of
+                          memory accesses
+  --enable-sim-inline=inlines
+                          Specify which functions should be inlined
   --enable-werror         treat compile warnings as errors
   --enable-build-warnings enable build-time compiler warnings if gcc is used
   --enable-sim-build-warnings
@@ -12302,7 +12310,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12305 "configure"
+#line 12313 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12408,7 +12416,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12411 "configure"
+#line 12419 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H