Mark vsoc_x86 as having overidden make rules

CtsPerfettoTestCases doesn't work well with x86+arm configurations.
Until we fix that, mark vsoc_x86 as having overriden make rules, so that
we can turn them into errors on other devices.

Bug: 77611511
Test: `m nothing` after switching the default to error
Change-Id: Iff4ec1611992239ea5d9db35d8eb580db947d603
diff --git a/vsoc_x86/BoardConfig.mk b/vsoc_x86/BoardConfig.mk
index 1450fcb..245229b 100644
--- a/vsoc_x86/BoardConfig.mk
+++ b/vsoc_x86/BoardConfig.mk
@@ -32,3 +32,4 @@
 TARGET_2ND_ARCH_VARIANT := armv7-a-neon
 TARGET_2ND_CPU_VARIANT := generic
 
+BUILD_BROKEN_DUP_RULES := true