moved PLATFORM and associated definitions from Makefile to kernel/Makefile so the kernel can be built by itself

git-svn-id: svn://anubis/hos/trunk@17 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/Makefile

@@ -2,6 +2,23 @@
 KERNEL  := hos
 LDFLAGS := -T link.ld
 
+export PLATFORM := $(shell if [[ `uname` =~ "CYGWIN" ]]; then \
+                             echo cygwin; \
+                           else \
+                             echo unix; \
+                           fi)
+ifeq ($(PLATFORM), cygwin)
+export LD		:= i586-elf-ld
+export CC		:= i586-elf-gcc
+export CXX		:= i586-elf-g++
+else
+export LD      := ld
+export CC      := gcc
+export CXX     := g++
+endif
+export NASM    := nasm
+
+
 .PHONY: all
 all: $(KERNEL).gz