Export RunBp2BuildTestCaseSimple() in testing.go

This is to support the migration of conversion tests to be next
to the files they're testing

Bug: 242070498
Test: m bp2build
Change-Id: I66243d420743273e7ebad70886cfe690740182c4
diff --git a/bp2build/cc_prebuilt_library_shared_test.go b/bp2build/cc_prebuilt_library_shared_test.go
index 9cee2dd..541ce5e 100644
--- a/bp2build/cc_prebuilt_library_shared_test.go
+++ b/bp2build/cc_prebuilt_library_shared_test.go
@@ -8,7 +8,7 @@
 )
 
 func TestSharedPrebuiltLibrary(t *testing.T) {
-	runBp2BuildTestCaseSimple(t,
+	RunBp2BuildTestCaseSimple(t,
 		Bp2buildTestCase{
 			Description:                "prebuilt library shared simple",
 			ModuleTypeUnderTest:        "cc_prebuilt_library_shared",
@@ -31,7 +31,7 @@
 }
 
 func TestSharedPrebuiltLibraryWithArchVariance(t *testing.T) {
-	runBp2BuildTestCaseSimple(t,
+	RunBp2BuildTestCaseSimple(t,
 		Bp2buildTestCase{
 			Description:                "prebuilt library shared with arch variance",
 			ModuleTypeUnderTest:        "cc_prebuilt_library_shared",
@@ -62,7 +62,7 @@
 }
 
 func TestSharedPrebuiltLibrarySharedStanzaFails(t *testing.T) {
-	runBp2BuildTestCaseSimple(t,
+	RunBp2BuildTestCaseSimple(t,
 		Bp2buildTestCase{
 			Description:                "prebuilt library shared with shared stanza fails because multiple sources",
 			ModuleTypeUnderTest:        "cc_prebuilt_library_shared",