made most things build on linux again

tools/insttest/Makefile

@@ -0,0 +1,16 @@
+# null, opengl
+BUILD=null
+
+# e.g. null -> -DRW_NULL
+BUILDDEF:=$(shell echo $(BUILD) | tr a-z A-Z | sed 's/^/-DRW_/')
+SRC := insttest.cpp
+OUT := insttest
+INC := -I/usr/local/include -I../..
+CFLAGS=-Wall -Wextra -g $(BUILDDEF) -Wno-parentheses -Wno-write-strings #-Wconversion
+LIB=../../librw-$(BUILD).a
+
+$(OUT): $(SRC) $(LIB)
+	$(CXX) $(CFLAGS) $(INC) $(SRC) $(LIB) -o $(OUT)
+
+clean:
+	rm -f $(OUT)