kernel: fixes for DEBUG_DUMPIPC mode

. add dependency of headers on debug.d
	. put the generated headers in the right dir
	. also resilience against future ELAST duplicate errno

Change-Id: I9d10702c8e09699a40138193f14defe902399da6

kernel/extract-errno.sh

@@ -8,5 +8,5 @@ tr -s ' \t' ' ' | \
 sed 's/^# /#/' | \
 egrep '^#define [A-Z_][A-Z0-9_]* \( ?_SIGN ?[0-9]+ ?\)' | \
 cut -d' ' -f2 | \
-sed 's/\(.*\)/IDENT(\1)/' | \
+sed 's/\(.*\)/IDENT(\1)/' | grep -v ELAST | \
 sort