Fill out platformName extension point for other platforms

Sources/SWBAndroidPlatform/Plugin.swift

@@ -109,6 +109,14 @@ struct AndroidPlatformExtension: PlatformInfoExtension {
             ])
         ]
     }
+
+    func platformName(triple: LLVMTriple) -> String? {
+        if triple.system == "linux" && triple.environment?.hasPrefix("android") == true {
+            return "android"
+        }
+
+        return nil
+    }
 }
 
 @_spi(Testing) public struct AndroidSDKRegistryExtension: SDKRegistryExtension {

Sources/SWBGenericUnixPlatform/Plugin.swift

@@ -92,6 +92,17 @@ struct GenericUnixPlatformInfoExtension: PlatformInfoExtension {
             ])
         }
     }
+
+    func platformName(triple: LLVMTriple) -> String? {
+        switch triple.system {
+        case "linux" where triple.environment?.hasPrefix("gnu") == true || triple.environment == "musl",
+            "freebsd",
+            "openbsd":
+            return triple.system
+        default:
+            return nil
+        }
+    }
 }
 
 struct GenericUnixSDKRegistryExtension: SDKRegistryExtension {

Sources/SWBQNXPlatform/Plugin.swift

@@ -66,6 +66,14 @@ struct QNXPlatformExtension: PlatformInfoExtension {
             ])
         ]
     }
+
+    func platformName(triple: LLVMTriple) -> String? {
+        if triple.system == "nto" {
+            return "qnx"
+        }
+
+        return nil
+    }
 }
 
 struct QNXSDKRegistryExtension: SDKRegistryExtension {

Sources/SWBWindowsPlatform/Plugin.swift

@@ -148,6 +148,14 @@ struct WindowsPlatformExtension: PlatformInfoExtension {
             return []
         }
     }
+
+    public func platformName(triple: LLVMTriple) -> String? {
+        if triple.system == "windows" {
+            return triple.system
+        }
+
+        return nil
+    }
 }
 
 struct WindowsSDKRegistryExtension: SDKRegistryExtension {