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;