[MAD Decoder] Patch a slight bug in libmad

There was a slight bug with handling Xing/LAME headers with main data
pointers indicating data preceding the header frame. This should allow
decoding their information properly.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Plugins/MAD/MADDecoder.m

@@ -178,6 +178,8 @@
 					}
 
 					free(tagBuffer);
+				} else if(stream.error == MAD_ERROR_BADDATAPTR) {
+					goto framedecoded;
 				}
 
 				continue;
@@ -190,6 +192,7 @@
 				break;
 			}
 		}
+	framedecoded:
 		framesDecoded++;
 
 		if(framesDecoded == 1) {

ThirdParty/libmad/README.md

@@ -1,6 +1,8 @@
-Built with the Homebrew defaults, sort of:
+Built with the Homebrew defaults, sort of. Plus a patch to fix weird LAME/Xing
+headers:
 
 ```
+patch -Np1 -i libmad_ancdata.patch
 touch NEWS
 touch AUTHORS
 touch ChangeLog
@@ -9,4 +11,4 @@ autoreconf -fiv
 make -j8 CFLAGS="-Os -arch x86_64 -arch arm64 -mmacosx-version-min=10.12" LDFLAGS="-arch x86_64 -arch arm64 -mmacosx-version-min=10.12"
 ```
 
-Version 0.15.1b was used.
+Version 0.15.1b was used, with the minor patch listed above.

ThirdParty/libmad/patches/libmad_ancdata.patch

@@ -0,0 +1,29 @@
+diff -urN libmad-0.15.1b.orig/frame.c libmad-0.15.1b.patched/frame.c
+--- libmad-0.15.1b.orig/frame.c	2022-06-19 17:20:02.000000000 -0700
++++ libmad-0.15.1b.patched/frame.c	2022-06-19 18:18:39.000000000 -0700
+@@ -473,7 +473,9 @@
+   return 0;
+ 
+  fail:
+-  stream->anc_bitlen = 0;
++  if(stream->error != MAD_ERROR_BADDATAPTR) {
++    stream->anc_bitlen = 0;
++  }
+   return -1;
+ }
+ 
+diff -urN libmad-0.15.1b.orig/layer3.c libmad-0.15.1b.patched/layer3.c
+--- libmad-0.15.1b.orig/layer3.c	2022-06-19 17:20:02.000000000 -0700
++++ libmad-0.15.1b.patched/layer3.c	2022-06-19 18:18:47.000000000 -0700
+@@ -2656,6 +2656,11 @@
+     stream->anc_ptr    = ptr;
+     stream->anc_bitlen = md_len * CHAR_BIT - data_bitlen;
+   }
++  else {
++    /* Give it the rest of the frame */
++    stream->anc_ptr    = stream->ptr;
++    stream->anc_bitlen = frame_free * CHAR_BIT;
++  }
+ 
+ # if 0 && defined(DEBUG)
+   fprintf(stderr,