imports: fix test to work with gccgo

Change-Id: I382905b7b7bd8189c169048ba05080ee96e1da5b
Reviewed-on: https://go-review.googlesource.com/117995
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/imports/fix_test.go b/imports/fix_test.go
index 62c6f3c..e287300 100644
--- a/imports/fix_test.go
+++ b/imports/fix_test.go
@@ -1214,13 +1214,16 @@
 
 	oldGOPATH := build.Default.GOPATH
 	oldGOROOT := build.Default.GOROOT
+	oldCompiler := build.Default.Compiler
 	build.Default.GOPATH = ""
+	build.Default.Compiler = "gc"
 	testHookScanDir = func(string) {}
 
 	defer func() {
 		testHookScanDir = func(string) {}
 		build.Default.GOPATH = oldGOPATH
 		build.Default.GOROOT = oldGOROOT
+		build.Default.Compiler = oldCompiler
 	}()
 
 	fn()