bp2build: Handle target.linux

Also refactor target.bionic to be handled not as its own configuration
axis, but instead to be grouped into os selects handling.

This allows us to remove libbase and its dependencies from the bp2build
denylist.

Test: mixed_droid.sh CI
Change-Id: I92f30074d286306207653fe37589835ae3db16c4
diff --git a/bazel/properties.go b/bazel/properties.go
index bd8ef0d..ee32e73 100644
--- a/bazel/properties.go
+++ b/bazel/properties.go
@@ -264,7 +264,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		la.Value = &value
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		if la.ConfigurableValues == nil {
 			la.ConfigurableValues = make(configurableLabels)
 		}
@@ -280,7 +280,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		return *la.Value
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		return *la.ConfigurableValues[axis][config]
 	default:
 		panic(fmt.Errorf("Unrecognized ConfigurationAxis %s", axis))
@@ -337,7 +337,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		ba.Value = value
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		if ba.ConfigurableValues == nil {
 			ba.ConfigurableValues = make(configurableBools)
 		}
@@ -353,7 +353,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		return ba.Value
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		if v, ok := ba.ConfigurableValues[axis][config]; ok {
 			return &v
 		} else {
@@ -459,7 +459,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		lla.Value = list
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		if lla.ConfigurableValues == nil {
 			lla.ConfigurableValues = make(configurableLabelLists)
 		}
@@ -475,7 +475,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		return lla.Value
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		return lla.ConfigurableValues[axis][config]
 	default:
 		panic(fmt.Errorf("Unrecognized ConfigurationAxis %s", axis))
@@ -773,7 +773,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		sla.Value = list
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		if sla.ConfigurableValues == nil {
 			sla.ConfigurableValues = make(configurableStringLists)
 		}
@@ -789,7 +789,7 @@
 	switch axis.configurationType {
 	case noConfig:
 		return sla.Value
-	case arch, os, osArch, bionic, productVariables:
+	case arch, os, osArch, productVariables:
 		return sla.ConfigurableValues[axis][config]
 	default:
 		panic(fmt.Errorf("Unrecognized ConfigurationAxis %s", axis))