We move /usr/lib/nethack/sysconf to /etc/nethack/sysconf since
this file is intended to be editable by root.

diff --git sys/unix/hints/linux sys/unix/hints/linux
index 8629150..9a4d722 100644
--- sys/unix/hints/linux
+++ sys/unix/hints/linux
@@ -23,7 +23,7 @@ POSTINSTALL=cp -n sys/unix/sysconf $(INSTDIR)/sysconf; $(CHOWN) $(GAMEUID) $(INS
 CFLAGS=-g -O -I../include -DNOTPARMDECL
 CFLAGS+=-DDLB
 CFLAGS+=-DCOMPRESS=\"/bin/gzip\" -DCOMPRESS_EXTENSION=\".gz\"
-CFLAGS+=-DSYSCF -DSYSCF_FILE=\"$(HACKDIR)/sysconf\" -DSECURE
+CFLAGS+=-DSYSCF -DSYSCF_FILE=\"/etc/nethack/sysconf\" -DSECURE
 CFLAGS+=-DTIMED_DELAY
 CFLAGS+=-DHACKDIR=\"$(HACKDIR)\"
 CFLAGS+=-DDUMPLOG