re PR go/78143 (bootstrap broken in libgo on powerpc-linux-gnu)

	PR go/78143
    runtime: build lfstack_32bit.go on ppc
    
    Missed a build tag.  This is GCC PR 78143.
    
    Reviewed-on: https://go-review.googlesource.com/32295

From-SVN: r241659

gcc/go/gofrontend/MERGE

-7fb11c908ddab4932cc416f16657cec3bc878a1a
+4a8df8f8622c140777996786866395448622ac3f
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/runtime/lfstack_32bit.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 arm nacl armbe m68k mips mipsle mips64p32 mips64p32le mipso32 mipsn32 s390 sparc
+// +build 386 arm nacl armbe m68k mips mipsle mips64p32 mips64p32le mipso32 mipsn32 ppc s390 sparc
 
 package runtime