compile_min.sh, add appropriate flags -O2, -s for release build

and drop
  '-fno-omit-frame-pointer'. This entry compensates for a compiler bug of actual mingw gcc 4.6.1.

which was introduced in commit

commit 5b1be4d32d
Author: h_vogt <h_vogt>
Date:   Sat Jan 28 09:59:27 2012 +0000

    prepare for release 24

compile_min.sh

@@ -51,14 +51,14 @@ if test "$1" = "64"; then
   echo "configuring for 64 bit"
   echo
 # You may add  --enable-adms to the following command for adding adms generated devices 
-  ../configure --with-wingui --enable-xspice --enable-cider --enable-openmp --disable-debug prefix="C:/Spice64" CFLAGS="-m64 -fno-omit-frame-pointer" LDFLAGS="-m64"
+  ../configure --with-wingui --enable-xspice --enable-cider --enable-openmp --disable-debug prefix="C:/Spice64" CFLAGS="-m64 -O2" LDFLAGS="-m64 -s"
 else
    cd release
    if [ $? -ne 0 ]; then  echo "cd release failed"; exit 1 ; fi
   echo "configuring for 32 bit"
   echo
 # You may add  --enable-adms to the following command for adding adms generated devices 
-  ../configure --with-wingui --enable-xspice --enable-cider --enable-openmp --disable-debug prefix="C:/Spice" CFLAGS="-m32 -fno-omit-frame-pointer" LDFLAGS="-m32"
+  ../configure --with-wingui --enable-xspice --enable-cider --enable-openmp --disable-debug prefix="C:/Spice" CFLAGS="-m32 -O2" LDFLAGS="-m32 -s"
 fi
 if [ $? -ne 0 ]; then  echo "../configure failed"; exit 1 ; fi