Fix VC98 build

examples/http-server/Makefile

@@ -6,22 +6,24 @@ CFLAGS_MONGOOSE += -DMG_HTTP_DIRLIST_TIME=1 -DMG_ENABLE_SSI=1
 CFLAGS_MONGOOSE += -DMG_ENABLE_LINES=1 -DMG_ENABLE_IPV6=1
 
 ifeq ($(OS),Windows_NT)
-  # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD
+  # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feprog.exe
   PROG ?= example.exe           # Use .exe suffix for the binary
   CC = gcc                      # Use MinGW gcc compiler
   CFLAGS += -lws2_32            # Link against Winsock library
   DELETE = cmd /C del /q /f /s  # Command prompt command to delete files
+  OUT ?= -o $(PROG)             # Build output
 else
   # Mac, Linux
   PROG ?= example
   DELETE = rm -rf
+  OUT ?= -o $(PROG)
 endif
 
 all: $(PROG)
 	$(RUN) ./$(PROG) $(ARGS)
 
 $(PROG): $(SOURCES)
-	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) -o $@
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) $(OUT)
 
 clean:
 	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM