non-srcdir build fixes

* guile-tools.in: Fix the checks to account for non-srcdir builds.

* libguile/frames.c:
* libguile/objcodes.c:
* libguile/programs.c:
* libguile/instructions.c:
* libguile/vm.c: Fix snarf-includes to cope with non-srcdir builds.

* libguile/instructions.h:
* libguile/instructions.c: Fix the stubs inclusion to be non-srcdir
  compatible.

* libguile/vm-expand.h (VM_DEFINE_INSTRUCTION): Fix some things so as not
  to require the instructions.h defintitions, since we have the codes
  already. Not important tho :)

* pre-inst-guile-env.in: Minor tweak that should have no effect.

* test-suite/standalone/Makefile.am (all-local): Remove a chmod +x step,
  the configure.ac rule should do that if necessary.

libguile/frames.c

@@ -305,7 +305,7 @@ scm_init_frames (void)
   scm_bootstrap_vm ();
 
 #ifndef SCM_MAGIC_SNARFER
-#include "frames.x"
+#include "libguile/frames.x"
 #endif
 }