Add BUILD_BROKEN_USES_NETWORK

Some people apparently still talk to the network during their build.
Allow this temporarily with a BUILD_BROKEN_USES_NETWORK check.

Bug: 129992021
Test: attempt to talk to the network during the build with and without
      this flag.
Change-Id: Ifb967c656aa24c4599e7232d0f1b5a303b5bac52

ui/build/dumpvars.go

@@ -203,6 +203,9 @@ func runMakeProductConfig(ctx Context, config Config) {
 		// Used to turn on --werror_ options in Kati
 		"BUILD_BROKEN_PHONY_TARGETS",
 
+		// Whether to enable the network during the build
+		"BUILD_BROKEN_USES_NETWORK",
+
 		// Not used, but useful to be in the soong.log
 		"BOARD_VNDK_VERSION",
 		"BUILD_BROKEN_ANDROIDMK_EXPORTS",
@@ -238,4 +241,5 @@ func runMakeProductConfig(ctx Context, config Config) {
 	config.SetPdkBuild(make_vars["TARGET_BUILD_PDK"] == "true")
 	config.SetBuildBrokenDupRules(make_vars["BUILD_BROKEN_DUP_RULES"] == "true")
 	config.SetBuildBrokenPhonyTargets(make_vars["BUILD_BROKEN_PHONY_TARGETS"] == "true")
+	config.SetBuildBrokenUsesNetwork(make_vars["BUILD_BROKEN_USES_NETWORK"] == "true")
 }