Set X11 window icon for standalone

Signed-off-by: falkTX <falktx@falktx.com>

src/Cardinal/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/CardinalFX/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/CardinalMini/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/CardinalMiniSep/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/CardinalNative/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/CardinalRemote/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/CardinalSynth/CardinalX11WindowIcon.cpp

@@ -0,0 +1 @@
+../CardinalX11WindowIcon.cpp

src/Makefile.cardinal.mk

@@ -100,6 +100,10 @@ ifeq ($(WINDOWS),true)
 FILES_UI += distrho.rc
 endif
 
+ifneq ($(HAIKU_OR_MACOS_OR_WASM_OR_WINDOWS),true)
+FILES_UI += CardinalX11WindowIcon.cpp
+endif
+
 # --------------------------------------------------------------
 # Rack and plugin libs