Disable RAR support.

The unrar code is under a non-free license, which isn't compatible with vbam's
GPL V2 or later.

--- 3aff3784cfc408bed41641c413f670728fe3c181/src/core/fex/CMakeLists.txt	2025-07-13 14:33:32.000000000 +0100
+++ 3aff3784cfc408bed41641c413f670728fe3c181/src/core/fex/CMakeLists.txt	2025-07-13 14:51:33.817418890 +0100
@@ -83,38 +83,6 @@
     fex/LZMA_Inflater.h
     fex/BZ2_Inflater.cpp
     fex/BZ2_Inflater.h
-    unrar/archive.cpp
-    unrar/arcread.cpp
-    unrar/blake2s_sse.cpp
-    unrar/blake2s.cpp
-    unrar/blake2sp.cpp
-    unrar/coder.cpp
-    unrar/crc.cpp
-    unrar/encname.cpp
-    unrar/extract.cpp
-    unrar/getbits.cpp
-    unrar/hash.cpp
-    unrar/headers.cpp
-    unrar/model.cpp
-    unrar/pathfn.cpp
-    unrar/rarvm.cpp
-    unrar/rarvmtbl.cpp
-    unrar/rawread.cpp
-    unrar/secpassword.cpp
-    unrar/strfn.cpp
-    unrar/suballoc.cpp
-    unrar/timefn.cpp
-    unrar/unicode.cpp
-    unrar/unpack.cpp
-    unrar/unpack15.cpp
-    unrar/unpack20.cpp
-    unrar/unpack30.cpp
-    unrar/unpack50.cpp
-    unrar/unpack50frag.cpp
-    unrar/unpackinline.cpp
-    unrar/unrar_misc.cpp
-    unrar/unrar_open.cpp
-    unrar/unrar.cpp
     PUBLIC
     fex.h
 )
--- 3aff3784cfc408bed41641c413f670728fe3c181/src/core/fex/fex/blargg_config.h	2025-07-13 14:33:32.000000000 +0100
+++ 3aff3784cfc408bed41641c413f670728fe3c181/src/core/fex/fex/blargg_config.h	2025-07-13 14:54:41.744055605 +0100
@@ -18,7 +18,7 @@
 //#define BLARGG_BUILD_DLL 1
 
 #ifndef FEX_ENABLE_RAR
-#define FEX_ENABLE_RAR 1
+#define FEX_ENABLE_RAR 0
 #endif
 
 #if FEX_ENABLE_BZ2
@@ -33,7 +33,7 @@
 #define FEX_TYPE_LZMA
 #endif
 
-#define FEX_TYPE_LIST fex_7z_type, fex_gz_type, fex_zip_type, fex_tar_type, fex_rar_type, FEX_TYPE_BZ2 FEX_TYPE_LZMA
+#define FEX_TYPE_LIST fex_7z_type, fex_gz_type, fex_zip_type, fex_tar_type, FEX_TYPE_BZ2 FEX_TYPE_LZMA
 
 // Use standard config.h if present
 #ifdef HAVE_CONFIG_H