Pocketbook: Add missing frontlight cdecls (koreader#1185)

Author: ezdiy

ffi-cdecl/inkview_decl.c

@@ -910,7 +910,10 @@ cdecl_func(hw_is_frontlight_auto_supported)
 cdecl_func(hw_set_frontlight_auto_enabled)
 
 cdecl_func(GetFrontlightVersion)
+cdecl_func(GetFrontlightState)
 cdecl_func(SetFrontlightState)
+cdecl_func(GetFrontlightEnabled)
+cdecl_func(SetFrontlightEnabled)
 cdecl_func(SetFrontlightStateEx)
 cdecl_func(OpenFrontLightConfig)
 cdecl_func(SwitchFrontlightState)

ffi/inkview_h.lua

@@ -1437,7 +1437,10 @@ int hw_is_frontlight_auto(void);
 int hw_is_frontlight_auto_supported(void);
 void hw_set_frontlight_auto_enabled(int);
 int GetFrontlightVersion(void);
+int GetFrontlightState(void);
 void SetFrontlightState(int);
+int GetFrontlightEnabled();
+void SetFrontlightEnabled(int);
 void SetFrontlightStateEx(int, int);
 void OpenFrontLightConfig();
 void SwitchFrontlightState();