Fix so Warewulf can build and lint without make config

internal/pkg/buildconfig/setconfigs.go.in

@@ -0,0 +1,16 @@
+package buildconfig
+
+func init() {
+    BINDIR = "@BINDIR@"
+    SYSCONFDIR = "@SYSCONFDIR@"
+    LOCALSTATEDIR = "@LOCALSTATEDIR@"
+    SRVDIR = "@SRVDIR@"
+    TFTPDIR = "@TFTPDIR@"
+    FIREWALLDDIR = "@FIREWALLDDIR@"
+    SYSTEMDDIR = "@SYSTEMDDIR@"
+    WWOVERLAYDIR = "@WWOVERLAYDIR@"
+    WWCHROOTDIR = "@WWCHROOTDIR@"
+    WWPROVISIONDIR = "@WWPROVISIONDIR@"
+    VERSION = "@VERSION@"
+    RELEASE = "@RELEASE@"
+}