Make sure SDL is disabled for static plugin target

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

source/Makefile.deps.mk

@@ -367,6 +367,8 @@ HAVE_QT4 = false
 HAVE_QT5 = false
 HAVE_QT5PKG = false
 HAVE_SDL = false
+HAVE_SDL1 = false
+HAVE_SDL2 = false
 USING_JUCE = false
 USING_JUCE_AUDIO_DEVICES = false
 USING_RTAUDIO = false