get rid of generic instances of asm/exec.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/ia64/include/asm/Kbuild b/arch/ia64/include/asm/Kbuild
index d4eb938..98efd48 100644
--- a/arch/ia64/include/asm/Kbuild
+++ b/arch/ia64/include/asm/Kbuild
@@ -13,3 +13,4 @@
 header-y += rse.h
 header-y += ucontext.h
 header-y += ustack.h
+generic-y += exec.h