Remove custom patches that are no longer in upstream

These were introduced in 6747068c, but they don't seem to be in upstream
(anymore). For the entry in rpm it may have even been a mixup with the
two sections in the rpm file: there's a "10 string" entry but only in
the delta part.

ext/fileinfo/magicdata.patch

@@ -1,20 +0,0 @@
-diff -ur Magdir.orig/rpm Magdir/rpm
---- Magdir.orig/rpm	2025-02-09 12:44:15.956602145 +0100
-+++ Magdir/rpm	2025-02-09 12:45:16.560624196 +0100
-@@ -34,6 +34,7 @@
- >>8	beshort		22		RISC-V64
- >>8	beshort		23		LoongArch64
- >>8	beshort		255		noarch
-+>>10	string		x		%s
- 
- #delta RPM    Daniel Novotny (dnovotny@redhat.com)
- 0	string		drpm		Delta RPM
-diff -ur Magdir.orig/securitycerts Magdir/securitycerts
---- Magdir.orig/securitycerts	2025-02-09 12:44:15.956628770 +0100
-+++ Magdir/securitycerts	2025-02-09 12:44:44.077144142 +0100
-@@ -4,3 +4,5 @@
- 0	search/1		-----BEGIN\ CERTIFICATE------	RFC1421 Security Certificate text
- 0	search/1		-----BEGIN\ NEW\ CERTIFICATE	RFC1421 Security Certificate Signing Request text
- 0	belong	0xedfeedfe	Sun 'jks' Java Keystore File data
-+
-+0	string \0volume_key	volume_key escrow packet