Exporting MakeBazelTarget() in testing.go

Since we are putting conversion tests in the same
package as the module being converted from now on

Test: m bp2build
Change-Id: Ied53589d497fef70bfa11d8f6067459c9a50cd72
diff --git a/bp2build/sh_conversion_test.go b/bp2build/sh_conversion_test.go
index d8f701d..92b3a65 100644
--- a/bp2build/sh_conversion_test.go
+++ b/bp2build/sh_conversion_test.go
@@ -66,7 +66,7 @@
     bazel_module: { bp2build_available: true },
 }`,
 		ExpectedBazelTargets: []string{
-			makeBazelTarget("sh_binary", "foo", AttrNameToString{
+			MakeBazelTarget("sh_binary", "foo", AttrNameToString{
 				"srcs":     `["foo.sh"]`,
 				"filename": `"foo.exe"`,
 				"sub_dir":  `"sub"`,
@@ -85,7 +85,7 @@
     bazel_module: { bp2build_available: true },
 }`,
 		ExpectedBazelTargets: []string{
-			makeBazelTarget("sh_binary", "foo", AttrNameToString{
+			MakeBazelTarget("sh_binary", "foo", AttrNameToString{
 				"srcs": `["foo.sh"]`,
 			})},
 	})