Fix redbean zip central directory lookup

This regression snuck in at some point. It resulted in the program
sometimes failing to load when the zip content was changed.

test/tool/net/test.mk

@@ -0,0 +1,69 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += TEST_TOOL_NET
+
+TEST_TOOL_NET = $(TOOL_NET_A_DEPS) $(TOOL_NET_A)
+TEST_TOOL_NET_A = o/$(MODE)/test/tool/net/net.a
+TEST_TOOL_NET_FILES := $(wildcard test/tool/net/*)
+TEST_TOOL_NET_SRCS = $(filter %.c,$(TEST_TOOL_NET_FILES))
+TEST_TOOL_NET_SRCS_TEST = $(filter %_test.c,$(TEST_TOOL_NET_SRCS))
+TEST_TOOL_NET_HDRS = $(filter %.h,$(TEST_TOOL_NET_FILES))
+TEST_TOOL_NET_COMS = $(TEST_TOOL_NET_OBJS:%.o=%.com)
+TEST_TOOL_NET_COMS = $(TEST_TOOL_NET_SRCS:%.c=o/$(MODE)/%.com)
+
+TEST_TOOL_NET_OBJS =					\
+	$(TEST_TOOL_NET_SRCS:%.c=o/$(MODE)/%.o)		\
+	o/$(MODE)/tool/net/redbean.com.zip.o
+
+TEST_TOOL_NET_BINS =					\
+	$(TEST_TOOL_NET_COMS)				\
+	$(TEST_TOOL_NET_COMS:%=%.dbg)
+
+TEST_TOOL_NET_TESTS =					\
+	$(TEST_TOOL_NET_SRCS_TEST:%.c=o/$(MODE)/%.com.ok)
+
+TEST_TOOL_NET_CHECKS =					\
+	$(TEST_TOOL_NET_HDRS:%=o/$(MODE)/%.ok)		\
+	$(TEST_TOOL_NET_SRCS_TEST:%.c=o/$(MODE)/%.com.runs)
+
+TEST_TOOL_NET_DIRECTDEPS =				\
+	LIBC_CALLS					\
+	LIBC_STUBS					\
+	LIBC_FMT					\
+	LIBC_STDIO					\
+	LIBC_INTRIN					\
+	LIBC_NEXGEN32E					\
+	LIBC_SYSV					\
+	LIBC_MEM					\
+	LIBC_RUNTIME					\
+	LIBC_X						\
+	LIBC_TESTLIB					\
+	LIBC_ZIPOS
+
+TEST_TOOL_NET_DEPS :=					\
+	$(call uniq,$(foreach x,$(TEST_TOOL_NET_DIRECTDEPS),$($(x))))
+
+$(TEST_TOOL_NET_A):					\
+		test/tool/net/				\
+		$(TEST_TOOL_NET_A).pkg			\
+		$(TEST_TOOL_NET_OBJS)
+
+$(TEST_TOOL_NET_A).pkg:					\
+		$(TEST_TOOL_NET_OBJS)			\
+		$(foreach x,$(TEST_TOOL_NET_DIRECTDEPS),$($(x)_A).pkg)
+
+o/$(MODE)/test/tool/net/%.com.dbg:			\
+		$(TEST_TOOL_NET_DEPS)			\
+		$(TEST_TOOL_NET_A)			\
+		o/$(MODE)/test/tool/net/%.o		\
+		$(TEST_TOOL_NET_A).pkg			\
+		$(LIBC_TESTMAIN)			\
+		$(CRT)					\
+		$(APE)
+	@$(APELINK)
+
+.PHONY: o/$(MODE)/test/tool/net
+o/$(MODE)/test/tool/net:				\
+		$(TEST_TOOL_NET_BINS)			\
+		$(TEST_TOOL_NET_CHECKS)