scripts/build: strip all executables in /usr

Some packages install outside /usr/*bin, e.g. /usr/lib/bluetooth
and executables remain unstripped. Try to strip everything
executable except .ko and .so which are handled in separate cases.

scripts/build

@@ -488,7 +488,7 @@ if [ "$TARGET" = "target" -o "$TARGET" = "init" ]; then
         if [ "$TARGET" = "init" ]; then
           $STRIP $(find $INSTALL -type f -name "*.so*" 2>/dev/null) 2>/dev/null || :
         fi
-        $STRIP $(find $INSTALL/bin $INSTALL/usr/bin $INSTALL/sbin $INSTALL/usr/sbin \
+        $STRIP $(find $INSTALL ! -name "*.so*" ! -name "*.ko" \
           -type f -executable 2>/dev/null) 2>/dev/null || :
     fi
   fi