Revert "bp2build allowlist //external/libcxx/..."

Revert submission 1814446

Reason for revert: causes failure of mixed_droid
Reverted Changes:
If5285f161:bp2build allowlist //external/libcxx/...
I4e7787374:bp2build: build //system/core/libprocessgroup:libp...
Ibec6d5fbe:bp2build: allowlist //external/brotli/... and buil...

Change-Id: I37327057a3df44cbb6e57d7f54120b3448da6057
diff --git a/android/bazel.go b/android/bazel.go
index e392aa5..bebb61b 100644
--- a/android/bazel.go
+++ b/android/bazel.go
@@ -141,7 +141,6 @@
 		"build/bazel/bazel_skylib":/* recursive = */ true,
 		"build/bazel/rules":/* recursive = */ true,
 		"build/bazel/rules_cc":/* recursive = */ true,
-		"build/bazel/scripts":/* recursive = */ true,
 		"build/bazel/tests":/* recursive = */ true,
 		"build/bazel/platforms":/* recursive = */ true,
 		"build/bazel/product_variables":/* recursive = */ true,
@@ -174,7 +173,6 @@
 		"external/arm-optimized-routines": Bp2BuildDefaultTrueRecursively,
 		"external/fmtlib":                 Bp2BuildDefaultTrueRecursively,
 		"external/jemalloc_new":           Bp2BuildDefaultTrueRecursively,
-		"external/libcxx":                 Bp2BuildDefaultTrueRecursively,
 		"external/libcxxabi":              Bp2BuildDefaultTrueRecursively,
 		"external/scudo":                  Bp2BuildDefaultTrueRecursively,
 		"prebuilts/clang/host/linux-x86":  Bp2BuildDefaultTrueRecursively,
@@ -239,7 +237,6 @@
 	// Per-module denylist to opt modules out of mixed builds. Such modules will
 	// still be generated via bp2build.
 	mixedBuildsDisabledList = []string{
-		"libc++_static",  // "error: no member named 'signbit' in the global namespace; did you mean 'sigwait'?"
 		"libc++abi",      // http://b/195970501, cc_library_static, duplicate symbols because it propagates libc objects.
 		"libc++demangle", // http://b/195970501, cc_library_static, duplicate symbols because it propagates libc objects.
 	}