improve architecture and Optimization comments in Makefiles

2012/dlowe/Makefile

@@ -50,13 +50,8 @@ CSTD= -std=gnu11
 
 # Compiler bit architecture
 #
-# Some entries require 32-bitness:
-# ARCH= -m32
-#
-# Some entries require 64-bitness:
-# ARCH= -m64
-#
-# By default we assume nothing:
+# Some entries require 32-bitness: ARCH= -m32
+# Some entries require 64-bitness: ARCH= -m64
 #
 ARCH=
 
@@ -70,11 +65,6 @@ CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
 
 # Optimization
 #
-# Most compiles will safely use -O2.  Some can use only -O1 or -O.
-# A few compilers have broken optimizers or this entry make break
-# under those buggy optimizers and thus you may not want anything.
-# Reasonable compilers will allow for -O3.
-#
 OPT= -O3
 
 # Default flags for ANSI C compilation