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/cc_prebuilt_library_shared_test.go b/bp2build/cc_prebuilt_library_shared_test.go
index bcf0ce2..9cee2dd 100644
--- a/bp2build/cc_prebuilt_library_shared_test.go
+++ b/bp2build/cc_prebuilt_library_shared_test.go
@@ -23,7 +23,7 @@
 	bazel_module: { bp2build_available: true },
 }`,
 			ExpectedBazelTargets: []string{
-				makeBazelTarget("prebuilt_library_shared", "libtest", AttrNameToString{
+				MakeBazelTarget("prebuilt_library_shared", "libtest", AttrNameToString{
 					"shared_library": `"libf.so"`,
 				}),
 			},
@@ -50,7 +50,7 @@
 	bazel_module: { bp2build_available: true },
 }`,
 			ExpectedBazelTargets: []string{
-				makeBazelTarget("prebuilt_library_shared", "libtest", AttrNameToString{
+				MakeBazelTarget("prebuilt_library_shared", "libtest", AttrNameToString{
 					"shared_library": `select({
         "//build/bazel/platforms/arch:arm": "libg.so",
         "//build/bazel/platforms/arch:arm64": "libf.so",