Do not build external plugins in DEBUG mode

They make bigger binaries, take longer to build and sometimes even fail.
We do not need them in DEBUG mode, since they are assumed to be tested and work well

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

source/Makefile.mk

@@ -570,10 +570,12 @@ LINK := ln -sf
 
 # ---------------------------------------------------------------------------------------------------------------------
 
+ifneq ($(DEBUG),true)
 ifneq (,$(wildcard $(CWD)/native-plugins/external/Makefile.mk))
 EXTERNAL_PLUGINS = true
 BASE_FLAGS += -DHAVE_EXTERNAL_PLUGINS
 include $(CWD)/native-plugins/external/Makefile.mk
 endif
+endif
 
 # ---------------------------------------------------------------------------------------------------------------------

source/native-plugins/Makefile

@@ -44,8 +44,12 @@ OBJS = \
 # ---------------------------------------------------------------------------------------------------------------------
 # Include external plugins, if present
 
+ifeq ($(EXTERNAL_PLUGINS),true)
 ifneq (,$(wildcard external/Makefile.mk2))
 include external/Makefile.mk2
+else
+$(error External plugins build requested but submodule not present, cannot build)
+endif
 endif
 
 # ---------------------------------------------------------------------------------------------------------------------