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_yasm_conversion_test.go b/bp2build/cc_yasm_conversion_test.go
index 2a71834..55d4feb 100644
--- a/bp2build/cc_yasm_conversion_test.go
+++ b/bp2build/cc_yasm_conversion_test.go
@@ -48,7 +48,7 @@
   srcs: ["main.cpp", "myfile.asm"],
 }`,
 		ExpectedBazelTargets: append([]string{
-			makeBazelTarget("yasm", "foo_yasm", map[string]string{
+			MakeBazelTarget("yasm", "foo_yasm", map[string]string{
 				"include_dirs": `["."]`,
 				"srcs":         `["myfile.asm"]`,
 			}),
@@ -81,7 +81,7 @@
   srcs: ["main.cpp", "myfile.asm"],
 }`,
 		ExpectedBazelTargets: append([]string{
-			makeBazelTarget("yasm", "foo_yasm", map[string]string{
+			MakeBazelTarget("yasm", "foo_yasm", map[string]string{
 				"include_dirs": `[
         "include1/foo",
         ".",
@@ -123,7 +123,7 @@
   },
 }`,
 		ExpectedBazelTargets: append([]string{
-			makeBazelTarget("yasm", "foo_yasm", map[string]string{
+			MakeBazelTarget("yasm", "foo_yasm", map[string]string{
 				"include_dirs": `["."]`,
 				"srcs": `select({
         "//build/bazel/platforms/arch:x86": ["myfile.asm"],
@@ -161,7 +161,7 @@
   },
 }`,
 		ExpectedBazelTargets: append([]string{
-			makeBazelTarget("yasm", "foo_yasm", map[string]string{
+			MakeBazelTarget("yasm", "foo_yasm", map[string]string{
 				"include_dirs": `["."]`,
 				"srcs": `["myfile.asm"] + select({
         "//build/bazel/platforms/arch:x86": ["mysecondfile.asm"],