test-includes: add LINTING_HEADERS #define to test poisoned headers

Some headers include poisons to ensure they're not used in improper
situations.  Add a LINTING_HEADERS #define to allow the header test to
check these poisoned headers.

Author: ehem

sys/sys/intr.h

@@ -29,13 +29,15 @@
 
 #ifndef _SYS_INTR_H_
 #define _SYS_INTR_H_
+#ifndef LINTING_HEADERS
 #ifndef INTRNG
 #error Need INTRNG for this file
 #endif
 
 #ifndef __MACHINE_INTERRUPT_H__
 #error "sys/intr.h included without architecture interrupt header!"
 #endif
+#endif
 
 /* FreeBSD standard interrupt controller interface */
 

tools/build/test-includes/Makefile

@@ -20,7 +20,7 @@ HDRS!=	(cd ${SRCTOP}/sys; ls sys/[!_]*.h | sort ; ls net*/[!_]*.h | sort)
 NO_PIC=	yes
 
 # Some files have to be clean for extra defines too...
-CFLAGS.event.c=	-D_WANT_KEVENT32 -D_WANT_FREEBSD11_KEVENT
+CFLAGS.event.c=	-D_WANT_KEVENT32 -D_WANT_FREEBSD11_KEVENT -DLINTING_HEADERS
 
 # We currently support C89 and newer compilers. Catch the odd little fussy
 # details like __inline that the header files must follow to support C89.

tools/build/test-includes/badfiles.inc

@@ -54,7 +54,6 @@ BADHDRS= \
 	sys/imgact_aout.h \
 	sys/imgact_elf.h \
 	sys/interrupt.h \
-	sys/intr.h \
 	sys/ioctl_compat.h \
 	sys/iov.h \
 	sys/iov_schema.h \