Makefiles: Rework build mode switching

Move the build_mode file from the top level into the scst directory. Write
build mode defines into scst/include/build_mode.h and include that file
directly or indirectly in all source files that depend on these #defines.
This approach has the advantage that "make clean" does no longer has to
be run when switching between build modes because the kernel build system
recognizes build_mode.h as a dependency and triggers a rebuild of all
source files that directly or indirectly include the build_mode.h header
file.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8347 d57e44dd-8a1f-0410-8b47-8ef2f437770f

scripts/specialize-patch

@@ -632,6 +632,7 @@ BEGIN {
 
   if (!process_file)
   {
+    sub("^+#ifdef INSIDE_KERNEL_TREE$", "+#if 1")
     print
     next
   }