amd64: symlink i386 includes into build dir

By creating an i386 symlink, this allows code compiled with -m32 to
build (32-bit vdso and linux bits) when -m32 support requires files
in the i386 hierarchy.

Reviewed by:	jhb, imp

Author: brooksdavis

sys/conf/kern.post.mk

@@ -360,6 +360,9 @@ _ILINKS+= ${MACHINE_CPUARCH}
 .if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
 _ILINKS+= x86
 .endif
+.if ${MACHINE_CPUARCH} == "amd64"
+_ILINKS+= i386
+.endif
 
 # Ensure that the link exists without depending on it when it exists.
 # Ensure that debug info references the path in the source tree.

sys/conf/kmod.mk

@@ -283,6 +283,9 @@ _ILINKS=machine
 .if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
 _ILINKS+=x86
 .endif
+.if ${MACHINE_CPUARCH} == "amd64"
+_ILINKS+=i386
+.endif
 CLEANFILES+=${_ILINKS}
 
 all: ${PROG}