Install the mpilib headers from mpt(4) into /usr/include/dev/mpt/mpilib.

This allows <sys/mpt_ioctl.h> to be used from userland.

Prodded by:	scottl

etc/mtree/BSD.include.dist

@@ -102,6 +102,10 @@
         ..
         lmc
         ..
+        mpt
+            mpilib
+            ..
+        ..
         ofw
         ..
         pbio

include/Makefile

@@ -59,6 +59,8 @@ LSUBDIRS=	cam/scsi \
 	ufs/ffs ufs/ufs
 #LSUBDIRS+=	netatm/ipatm netatm/sigpvc netatm/spans netatm/uni
 
+LSUBSUBDIRS=	dev/mpt/mpilib
+
 .if ${MACHINE_ARCH} == "powerpc"
 _dev_powermac_nvram=	dev/powermac_nvram
 .endif
@@ -72,7 +74,7 @@ INCS+=	hesiod.h
 .endif
 
 .if ${MK_BLUETOOTH} != "no"
-LSUBSUBDIRS=	netgraph/bluetooth/include
+LSUBSUBDIRS+=	netgraph/bluetooth/include
 .endif
 
 # XXX unconditionally needed by <netsmb/netbios.h>