src/mkhdr: support Solaris x86

src/mkhdr

diff --git a/src/mkhdr b/src/mkhdr
index 8ec8e83..3d3f325 100644
--- a/src/mkhdr
+++ b/src/mkhdr
@@ -2,6 +2,7 @@
 # objtype rules also in Makefile
 OBJTYPE=`uname -m | sed '
 	s;i.86;386;;
+	s;i86pc;386;;
 	s;amd64;x86_64;;
 	s;/.*;;;
 	s; ;;g;