os: fix build tags for dir_regfile.go

    
    We want to build dir_regfile.go if not GNU/linux, and not solaris/386,
    and not solaris/sparc.  The latter two conditions were incorrect.  To
    write ! solaris/386 we have to write !solaris !386.  I forgot De
    Morgan's Law.
    
    Reviewed-on: https://go-review.googlesource.com/26870

From-SVN: r239393

gcc/go/gofrontend/MERGE

-5e05b7bc947231b4d5a8327bf63e2fa648e51dc7
+fe1e77f843220503f1f8d5ea7dd5e307580e1d38
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/os/dir_regfile.go

@@ -6,8 +6,8 @@
 // license that can be found in the LICENSE file.
 
 // +build !linux
-// +build !solaris,386
-// +build !solaris,sparc
+// +build !solaris !386
+// +build !solaris !sparc
 
 package os