get rid of generic instances of asm/exec.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
index 04d02a5..b68ad4b 100644
--- a/arch/cris/include/asm/Kbuild
+++ b/arch/cris/include/asm/Kbuild
@@ -7,3 +7,5 @@
 header-y += etraxgpio.h
 header-y += rs485.h
 header-y += sync_serial.h
+
+generic-y += exec.h