Do not enable optimizations by default when compiling python from sou…

…rce.

- It takes significantly longer to compile python with this flag (typically
  about 5x), and this slows down the integration tests significantly.
- This change does not affect the pre-built binaries on the bionic and jammy
  stacks - just the compilation from source on wildcard (*) stacks.
- Users who want to use this buildpack to compile python from source can pass
  that flag via the existing BP_CONFIGURE_FLAGS environment variable mechanism.

installer.go

@@ -52,7 +52,7 @@ func (i CPythonInstaller) Install(
 	flags, _ := entry.Metadata["configure-flags"].(string)
 
 	if flags == "" {
-		flags = "--enable-optimizations --with-ensurepip"
+		flags = "--with-ensurepip"
 		i.logger.Debug.Subprocess("Using default configure flags: %v\n", flags)
 	}
 

installer_test.go

@@ -85,7 +85,6 @@ func testCPythonInstaller(t *testing.T, context spec.G, it spec.S) {
 			Expect(configureProcess.ExecuteCall.CallCount).To(Equal(1))
 			Expect(configureProcess.ExecuteCall.Receives.Execution).To(MatchFields(IgnoreExtras, Fields{
 				"Args": Equal([]string{
-					"--enable-optimizations",
 					"--with-ensurepip",
 					fmt.Sprintf("--prefix=%s", layerPath),
 				}),