Switch to Makefile for build system

Makefile

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+CC=cc
+
+DIST=build
+OUT=$(DIST)/alisp.out
+
+UNITS=main.c $(shell find ./runtime -type 'f')
+OBJECTS:=$(patsubst %.c, $(DIST)/%.o, $(UNITS))
+
+LDFLAGS=
+GFLAGS=-Wall -Wextra -Wpedantic -std=c23 -I./
+DFLAGS=-ggdb -fsanitize=address -fsanitize=undefined
+RFLAGS=-O3
+
+MODE=release
+ifeq ($(MODE), release)
+CFLAGS=$(GFLAGS) $(RFLAGS)
+else
+CFLAGS=$(GFLAGS) $(DFLAGS)
+endif
+
+# Dependency generation
+DEPFLAGS=-MT $@ -MMD -MP -MF
+DEPDIR=$(DIST)/deps
+
+$(OUT): $(OBJECTS) | $(DIST)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+$(DIST)/%.o: %.c | $(DIST) $(DEPDIR)
+	$(CC) $(CFLAGS) $(DEPFLAGS) $(DEPDIR)/$*.d -c -o $@ $<
+
+$(DIST):
+	mkdir -p $(DIST) $(DIST)/runtime
+
+$(DEPDIR):
+	mkdir -p $(DEPDIR)
+	mkdir -p $(DEPDIR)/runtime
+
+clangd: compile_commands.json
+compile_commands.json: Makefile
+	bear -- $(MAKE) -B MODE=debug
+
+.PHONY: run clean examples
+ARGS=
+run: $(OUT)
+	./$^ $(ARGS)
+
+clean:
+	rm -rf $(DIST)
+
+DEPS:=$(patsubst %.c,$(DEPDIR)/%.d, $(UNITS))
+include $(wildcard $(DEPS))