$NetBSD$

Honors user's {C,LD}FLAGS.

--- Makefile.orig	2020-10-29 13:36:16.000000000 +0000
+++ Makefile
@@ -35,7 +35,7 @@ CC = $(WIN32_DEV_TOP)/mingw-4.7.2/bin/gc
 
 DATA_ROOT_DIR_PURPLE:="$(PROGFILES32)/Pidgin"
 PLUGIN_DIR_PURPLE:="$(DATA_ROOT_DIR_PURPLE)/plugins"
-CFLAGS = \
+CFLAGS += \
     -g \
     -O2 \
     -Wall \
@@ -54,7 +54,7 @@ PLUGIN_DIR_PURPLE:=$(DESTDIR)$(shell pkg
 DATA_ROOT_DIR_PURPLE:=$(DESTDIR)$(shell pkg-config --variable=datarootdir $(PURPLE_MOD))
 PKGS=$(PURPLE_MOD) glib-2.0 gobject-2.0
 
-CFLAGS = \
+CFLAGS += \
     -g \
     -O2 \
     -Wall \
@@ -72,7 +72,7 @@ endif
 .PHONY: all
 all: $(LIBNAME)
 
-LDFLAGS = -shared
+LDFLAGS += -shared
 
 json.%: json-parser/json.%
 	cp $< $@