Use erlang halt vs init stop in Makefile

In Erlang/OTP 26 a race condition was uncovered when using `-eval` with `-s init stop` (i.e., it was always there, but most of the community lucked out in not running into it).

See erlang/otp#6916 for details

c_src/Makefile

@@ -20,7 +20,7 @@ endif
 
 # Project specific C compiler/flags.
 ifeq ($(ERTS_INCLUDE_DIR),)
-	ERTS_INCLUDE_DIR := $(shell "$(ERL)" -noshell -s init stop -eval "io:format(\"~ts/erts-~ts/include/\", [code:root_dir(), erlang:system_info(version)]).")
+	ERTS_INCLUDE_DIR := $(shell "$(ERL)" -noshell -eval "io:format(\"~ts/erts-~ts/include/\", [code:root_dir(), erlang:system_info(version)])." -s erlang halt)
 endif
 
 CFLAGS += -std=c11 -fPIC -I $(ERTS_INCLUDE_DIR)
@@ -64,4 +64,4 @@ _build/:
 	mkdir -p "$@"
 
 $(BASEDIR)/priv/:
-	mkdir -p "$@"
+	mkdir -p "$@"