bsd-user: Catch up with sys/param.h requirement for machine/pmap.h

Some versions of FreeBSD now require sys/param.h for machine/pmap.h on
x86. Include them here to meet that requirement. It does no harm on
older versions, so there's no need to #ifdef it.

Signed-off-by:  Muhammad Moinur Rahman <bofh@FreeBSD.org>
Reviewed-by:	John Baldwin <jhb@FreeBSD.org>
Signed-off-by:	Warner Losh <imp@bsdimp.com>

bsd-user/host/i386/host-signal.h

@@ -9,6 +9,7 @@
 #ifndef I386_HOST_SIGNAL_H
 #define I386_HOST_SIGNAL_H
 
+#include <sys/param.h>
 #include <sys/ucontext.h>
 #include <machine/trap.h>
 #include <vm/pmap.h>

bsd-user/host/x86_64/host-signal.h

@@ -9,6 +9,7 @@
 #ifndef X86_64_HOST_SIGNAL_H
 #define X86_64_HOST_SIGNAL_H
 
+#include <sys/param.h>
 #include <sys/ucontext.h>
 #include <machine/trap.h>
 #include <vm/pmap.h>