Improve python3 arguments for bitcode-build-tool

The script features `-B` in `#!`

build-tools/src/main/kotlin/org/jetbrains/kotlin/FrameworkTest.kt

@@ -222,6 +222,6 @@ open class FrameworkTest : DefaultTask(), KonanTestExecutable {
                 ?: error("Can't find python3")
 
         runTest(executorService = localExecutorService(project), testExecutable = python3,
-                args = listOf(bitcodeBuildTool, "--sdk", sdk, "-v", "-t", toolPath, frameworkBinary))
+                args = listOf("-B", bitcodeBuildTool, "--sdk", sdk, "-v", "-t", toolPath, frameworkBinary))
     }
 }