Don't let rpm complain about a missing /etc/magic.mgc file

--- ./build/rpmfc.c.orig	2019-10-02 11:41:15.063357579 +0000
+++ ./build/rpmfc.c	2019-10-02 11:41:42.583298884 +0000
@@ -1065,7 +1065,7 @@ static int initAttrs(rpmfc fc)
 
 rpmRC rpmfcClassify(rpmfc fc, ARGV_t argv, rpm_mode_t * fmode)
 {
-    int msflags = MAGIC_CHECK | MAGIC_COMPRESS | MAGIC_NO_CHECK_TOKENS;
+    int msflags = MAGIC_COMPRESS | MAGIC_NO_CHECK_TOKENS;
     int nerrors = 0;
     rpmRC rc = RPMRC_FAIL;