Bug 1656141 - Remove dav1d.rc. r=achronop

RCFILE is only actually used when the moz.build that contains it defines
a binary, which is not the case for dav1d, which ends up in gkmedias.dll.
Which also means that moving the definition to gkmedias would also not
make sense, since all dav1d.rc does is add descriptors to the dll that it
contains dav1d and what version, but gkmedias.dll contains other things
too.

Differential Revision: https://phabricator.services.mozilla.com/D86152

media/libdav1d/README_MOZILLA

@@ -31,13 +31,6 @@ The rough steps are:
   to media/libdav1d/vcs_version.h
 - Copy version.h from local build/include/dav1d/version.h to
   media/libdav1d/version.h
-- Update dav1d.rc:
-  - update the API_VERSION_NUMBER, API_VERSION_NUMBER_STR, defines to
-    match the 'dav1d_soname_version' field in
-    third_party/dav1d/meson.build.
-  - update the PROJECT_VERSION_NUMBER, PROJECT_VERSION_NUMBER_STR
-    defines to match the new project versions from the git tag (or from
-    the project version found in third_party/dav1d/meson.build).
 - Add new options, if any, in moz.build or config.h
 
 Tips:

media/libdav1d/dav1d.rc

@@ -1,32 +0,0 @@
-#define API_VERSION_NUMBER 4,0,2,0
-#define API_VERSION_NUMBER_STR "4.0.2"
-#define PROJECT_VERSION_NUMBER 0,7,1,0
-#define PROJECT_VERSION_NUMBER_STR "0.7.1"
-
-#include <windows.h>
-
-1 VERSIONINFO
-FILETYPE VFT_DLL
-FILEOS VOS_NT_WINDOWS32
-PRODUCTVERSION PROJECT_VERSION_NUMBER
-FILEVERSION API_VERSION_NUMBER
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    BEGIN
-      VALUE "CompanyName", "VideoLAN"
-      VALUE "ProductName", "dav1d"
-      VALUE "ProductVersion", PROJECT_VERSION_NUMBER_STR
-      VALUE "FileVersion", API_VERSION_NUMBER_STR
-      VALUE "FileDescription", "dav1d " PROJECT_VERSION_NUMBER_STR " - AV1 decoder"
-      VALUE "InternalName", "dav1d"
-      VALUE "OriginalFilename", "libdav1d.dll"
-      VALUE "LegalCopyright", "Copyright \251 @COPYRIGHT_YEARS@ VideoLAN and dav1d Authors"
-    END
-  END
-  BLOCK "VarFileInfo"
-  BEGIN
-    VALUE "Translation", 0x409, 1252
-  END
-END

media/libdav1d/moz.build

@@ -197,7 +197,6 @@ EXPORTS.dav1d += [
 ]
 
 if CONFIG['OS_TARGET'] == 'WINNT':
-    RCFILE = 'dav1d.rc'
     SOURCES += [
         '../../third_party/dav1d/src/win32/thread.c'
     ]