Do not set exported symbols list if building under DEBUG

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

Makefile.plugins.mk

@@ -127,7 +127,7 @@ SYMBOLS_LV2UI  = $(DPF_PATH)/utils/symbols/lv2-ui.def
 SYMBOLS_LV2    = $(DPF_PATH)/utils/symbols/lv2.def
 SYMBOLS_VST2   = $(DPF_PATH)/utils/symbols/vst2.def
 SYMBOLS_VST3   = $(DPF_PATH)/utils/symbols/vst3.def
-else
+else ifneq ($(DEBUG),true)
 SYMBOLS_LADSPA = -Wl,--version-script=$(DPF_PATH)/utils/symbols/ladspa.version
 SYMBOLS_DSSI   = -Wl,--version-script=$(DPF_PATH)/utils/symbols/dssi.version
 SYMBOLS_LV2DSP = -Wl,--version-script=$(DPF_PATH)/utils/symbols/lv2-dsp.version