Boot kernel for ARMv8 needs more memory to build - added 1GB swap

Makefile

@@ -55,6 +55,10 @@ boot-armv7:
 	rm -rf linux-5.2.8
 
 boot-armv8:
+	dd if=/dev/zero of=swap bs=1048576 count=1024
+	chmod 600 swap
+	mkswap swap
+	swapon swap
 	tar xf linux-5.2.8.tar.xz
 	mv config linux-5.2.8/.config
 	bash -c 'files=`ls -1 /kernelconfig/boot-linux-armv8` ; for config in $$files ; do cat /kernelconfig/boot-linux-armv8/$$config >> linux-5.2.8/.config ; done'
@@ -67,6 +71,8 @@ boot-armv8:
 	cp -v linux-5.2.8/.config boot/config-5.2.8
 	ln -sf config-5.2.8 boot/config
 	rm -rf linux-5.2.8
+	swapoff swap
+	rm -rf swap
 
 boot-x86_64:
 	tar xf linux-5.2.8.tar.xz