Remove forced debugging or optimization flags.

--- a/configure
+++ b/configure
@@ -261,16 +261,6 @@ case x"$CXX" in
   *) CXXFLAGS="${CXXFLAGS}-W";;
 esac
 
-if [ $debug = yes ]
-then
-  CXXFLAGS="$CXXFLAGS -g"
-else
-  case x"$CXX" in
-    x*g++*|x*clang++*) CXXFLAGS="$CXXFLAGS -O3";;
-    *) CXXFLAGS="$CXXFLAGS -O";;
-  esac
-fi
-
 if [ $m32 = yes ]
 then
   case x"$CXX" in