internal: move sysconf wrapper to app

This should not be used and is not useful in other packages.

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

internal/app/sysconf.go

@@ -0,0 +1,8 @@
+package app
+
+//#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)) }