internal/validate: relocate from app

These are free of the dispatcher from internal/app. This change relocates them into their own package.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/validate/sysconf.go

@@ -0,0 +1,8 @@
+package validate
+
+//#include <unistd.h>
+import "C"
+
+const SC_LOGIN_NAME_MAX = C._SC_LOGIN_NAME_MAX
+
+func Sysconf(name C.int) int { return int(C.sysconf(name)) }