Add support for specifying target for dependencies

- Use <dependency target="target"> to specify which target the dependency
should be compiled for.
- Fix binary not being removed when doing makegen clean

src/ConfigFile.h

@@ -6,6 +6,7 @@
 #include <vector>
 
 #include "ConfigUtils.h"
+#include "Dependency.h"
 #include "FlagData.h"
 #include "xml/XMLObject.h"
 
@@ -23,6 +24,8 @@ private:
   std::string configPath;
   std::vector<ConfigFile> dependencyConfigs;
 
+  std::vector<Dependency> dependencies;
+
   bool hasInitError = false;
 
 public:
@@ -37,6 +40,7 @@ public:
   bool GetSettingBool(ConfigSetting setting);
   std::vector<std::string>& GetSettingVectorString(ConfigSetting setting);
   std::vector<std::string> GetSetting(ConfigSetting setting);
+  const std::vector<Dependency>& GetDependencies() const;
 
   bool SetSettingString(ConfigSetting setting, const std::string& value);
   bool AddSettingVectorString(ConfigSetting setting, const std::string& value);
@@ -48,6 +52,7 @@ public:
 
 private:
   void Init(const FlagData& flagData);
+  void InitDependencies();
 
 public:
   static ConfigFile Gen(const FlagData& flagData);