build-sys: Relocate library to library/

All the dependent programs needed to have their includes moved too

Signed-off-by: Craig Small <csmall@dropbear.xyz>

library/include/wchan.h

@@ -0,0 +1,6 @@
+#ifndef PROCPS_PROC_WCHAN_H
+#define PROCPS_PROC_WCHAN_H
+
+extern const char *lookup_wchan (int pid);
+
+#endif