sim: msp430: delete redundant comments & settings

These were copied from the example docs, so aren't adding any value.

sim/msp430/Makefile.in

@@ -18,31 +18,9 @@
 
 ## COMMON_PRE_CONFIG_FRAG
 
-# These variables are given default values in COMMON_PRE_CONFIG_FRAG.
-# We override the ones we need to here.
-# Not all of these need to be mentioned, only the necessary ones.
-# In fact it is better to *not* mention ones if the value is the default.
-
-# List of object files, less common parts.
 SIM_OBJS = \
 	$(SIM_NEW_COMMON_OBJS) \
 	msp430-sim.o \
 	sim-resume.o
 
-# List of extra dependencies.
-# Generally this consists of simulator specific files included by sim-main.h.
-SIM_EXTRA_DEPS =
-# List of flags to always pass to $(CC).
-SIM_EXTRA_CFLAGS =
-# List of extra libraries to link with.
-SIM_EXTRA_LIBS =
-# Dependency of `install' to install any extra files.
-SIM_EXTRA_INSTALL =
-# Dependency of `clean' to clean any extra files.
-SIM_EXTRA_CLEAN =
-
 ## COMMON_POST_CONFIG_FRAG
-
-# Rules need to build $(SIM_OBJS), plus whatever else the target wants.
-
-# ... target specific rules ...