Fix compiler warnings, fixup for updated pugl

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

source/Makefile.deps.mk

@@ -455,7 +455,7 @@ ifneq ($(USE_GLES2)$(USE_GLES3),true)
 DGL_LIBS   = -sLEGACY_GL_EMULATION -sGL_UNSAFE_OPTS=0
 endif
 else ifeq ($(WINDOWS),true)
-DGL_LIBS   = -lopengl32 -lgdi32
+DGL_LIBS   = -lcomdlg32 -ldwmapi -lopengl32 -lgdi32
 else
 DGL_FLAGS += -DHAVE_X11 -DHAVE_XCURSOR -DHAVE_XEXT -DHAVE_XSYNC -DHAVE_XRANDR
 DGL_FLAGS += $(shell $(PKG_CONFIG) --cflags gl x11 xcursor xext xrandr)

source/backend/plugin/CarlaPluginVST3.cpp

@@ -1017,6 +1017,8 @@ private:
         return loop->posixfds.append(posixfd) ? V3_OK : V3_NOMEM;
       #else
         return V3_NOT_IMPLEMENTED;
+        // unused
+        (void)self; (void)handler; (void)fd;
       #endif
     }
 
@@ -1043,6 +1045,8 @@ private:
         return V3_INVALID_ARG;
        #else
         return V3_NOT_IMPLEMENTED;
+        // unused
+        (void)self; (void)handler;
        #endif
     }