Initial git commit of OS makefiles (after some time in fossil) with an attempt at using git submodules, but not buildable yet (will be using old paths in the Makefiles and in some submodules).

.gitmodules

@@ -0,0 +1,18 @@
+[submodule "slkern"]
+	path = slkern
+	url = https://proto.securelang.com/SecureLang/slkern.git
+[submodule "sllibc"]
+	path = sllibc
+	url = https://proto.securelang.com/SecureLang/sllibc.git
+[submodule "sllul"]
+	path = sllul
+	url = https://proto.securelang.com/SecureLang/sllul.git
+[submodule "slmkfs"]
+	path = slmkfs
+	url = https://proto.securelang.com/SecureLang/slmkfs.git
+[submodule "slbldtls"]
+	path = slbldtls
+	url = https://proto.securelang.com/SecureLang/slbldtls.git
+[submodule "slabpkg"]
+	path = slabpkg
+	url = https://proto.securelang.com/SecureLang/slabpkg.git