Makefile*, kraft.yaml: Change newlib to musl

This commit changes the newlib dependency with the newer musl one
because it is the new standard.

Signed-off-by: Darius-Andrei Jipa <jipad16@yahoo.com>
Reviewed-by: Eduard Vintilă <eduard.vintila47@gmail.com>
Reviewed-by: Stefan Jumarea <stefanjumarea02@gmail.com>
Approved-by: Razvan Deaconescu <razvand@unikraft.io>
Tested-by: Unikraft CI <monkey@unikraft.io>
GitHub-Closes: #9

Makefile

@@ -0,0 +1,9 @@
+UK_ROOT ?= $(PWD)/.unikraft/unikraft
+UK_LIBS ?= $(PWD)/.unikraft/libs
+LIBS := $(UK_LIBS)/musl:$(UK_LIBS)/lua
+
+all:
+	@$(MAKE) -C $(UK_ROOT) A=$(PWD) L=$(LIBS)
+
+$(MAKECMDGOALS):
+	@$(MAKE) -C $(UK_ROOT) A=$(PWD) L=$(LIBS) $(MAKECMDGOALS)

Makefile.uk

@@ -0,0 +1 @@
+$(eval $(call addlib,applua))

kraft.yaml

@@ -1,6 +1,6 @@
 specification: '0.5'
 name: lua
-unikraft: '0.5'
+unikraft: 'stable'
 targets:
   - architecture: x86_64
     platform: linuxu
@@ -9,9 +9,10 @@ targets:
   - architecture: x86_64
     platform: xen
 libraries:
-  newlib: '0.5'
+  musl:
+    version: stable
   lua:
-    version: '0.5'
+    version: '0.13.1'
     kconfig:
       - CONFIG_LIBLUA=y
       - CONFIG_LIBLUA_MAIN_FUNCTION=y