Build: Add fast build mode that does not clean everything or run tests

Passing the "-f" or "--fast" option to the ./makeall.sh script will
build everything without cleaning first, and then will skip tests.

Kernel/makeall.sh

@@ -10,6 +10,18 @@ build_group=$(id -g)
 export build_user
 export build_group
 
+fast_mode=
+while [ "$1" != "" ]; do
+    case $1 in
+        -f | --fast )           fast_mode=1
+                                ;;
+        -h | --help )           echo "-f or --fast: build fast without cleaning or running tests"
+                                exit 0
+                                ;;
+    esac
+    shift
+done
+
 sudo id
 
 MAKE=make
@@ -18,8 +30,14 @@ if [ "$(uname -s)" = "OpenBSD" ]; then
 	MAKE=gmake
 fi
 
-$MAKE -C ../ clean && \
+if [ $fast_mode = 1 ]; then
     $MAKE -C ../ && \
-    $MAKE -C ../ test && \
-    $MAKE -C ../ install &&
-    sudo -E PATH="$PATH" ./build-image-qemu.sh
+        $MAKE -C ../ install &&
+        sudo -E PATH="$PATH" ./build-image-qemu.sh
+else
+    $MAKE -C ../ clean && \
+        $MAKE -C ../ && \
+        $MAKE -C ../ test && \
+        $MAKE -C ../ install &&
+        sudo -E PATH="$PATH" ./build-image-qemu.sh
+fi