Makefile - default to Debug for make target

Makefile

@@ -7,7 +7,7 @@ SITE=_site
 BUILDDIR=build
 FUZZCHARS?=2000000  # for fuzztest
 PROG?=$(BUILDDIR)/src/cmark
-BUILDTYPE?=Release
+BUILDTYPE?=Debug
 
 .PHONY: all spec leakcheck clean fuzztest dingus upload jshint test testjs benchjs update-site upload-site check
 
@@ -15,7 +15,7 @@ all: check man/man1/cmark.1
 	mkdir -p $(BUILDDIR); cd build; cmake .. -DCMAKE_BUILD_TYPE=$(BUILDTYPE); make
 
 install: check
-	mkdir -p $(BUILDDIR); cd build; cmake .. -DCMAKE_BUILD_TYPE=$(BUILDTYPE); make install
+	mkdir -p $(BUILDDIR); cd build; cmake .. -DCMAKE_BUILD_TYPE=Release; make install
 
 clean:
 	rm -rf $(BUILDDIR)