Place build outputs in obj/ and bin/ directories

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

forms/.gitignore

@@ -0,0 +1,2 @@
+obj/
+bin/

forms/README.md

@@ -36,8 +36,8 @@ Windows 3.1 controls and sends user events back to the server.
 ## Building
 
 ```
-make              # builds dfm2form and formsrv.o
-make clean        # removes build artifacts
+make              # builds bin/dfm2form and obj/formsrv.o
+make clean        # removes obj/ and bin/
 ```
 
 Requires GCC on Linux.  The Delphi unit (`formcli.pas`) is compiled as

forms/makefile

@@ -2,15 +2,21 @@ CC      = gcc
 CFLAGS  = -Wall -Wextra -std=c99 -O2
 LDFLAGS =
 
-all: dfm2form formsrv.o
+OBJDIR = obj
+BINDIR = bin
 
-dfm2form: dfm2form.c
+all: $(BINDIR)/dfm2form $(OBJDIR)/formsrv.o
+
+$(BINDIR)/dfm2form: dfm2form.c | $(BINDIR)
 	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
 
-formsrv.o: formsrv.c formsrv.h
+$(OBJDIR)/formsrv.o: formsrv.c formsrv.h | $(OBJDIR)
 	$(CC) $(CFLAGS) -c -o $@ formsrv.c
 
+$(OBJDIR) $(BINDIR):
+	mkdir -p $@
+
 clean:
-	rm -f dfm2form formsrv.o
+	rm -rf $(OBJDIR) $(BINDIR)
 
 .PHONY: all clean