Remove patches to ffmpeg wraps

Equivalent functionality (allowing dependencies to be meson subprojects
and fixing the zlib HAVE_UNISTD_H issue) was merged upstream now
(thanks kasper), so this is no longer necessary. dav1d is now
enabled using -Dffmpeg:libdav1d=enabled.

subprojects/ffmpeg.wrap

@@ -3,7 +3,6 @@ directory = ffmpeg
 url = https://gitlab.freedesktop.org/gstreamer/meson-ports/ffmpeg.git
 revision = meson-6.1
 depth = 1
-diff_files = ffmpeg/0001.patch
 
 [provide]
 libavformat = libavformat_dep

subprojects/packagefiles/ffmpeg/0001.patch

@@ -1,100 +0,0 @@
-diff --git a/meson.build b/meson.build
-index 27d1387315..e8d7d3ccc2 100644
---- a/meson.build
-+++ b/meson.build
-@@ -1042,7 +1042,7 @@ check_components = [
-   ['user32', ['windows.h', 'winuser.h'], ['GetShellWindow'], ['user32']],
-   ['vfw32', ['windows.h', 'vfw.h'], ['capCreateCaptureWindow'], ['vfw3']],
-   ['vaapi', ['va/va.h'], ['vaInitialize'], ['va']],
--  ['zlib', ['zlib.h'], ['zlibVersion'], ['z']],
-+  ['zlib', ['zlib.h'], ['zlibVersion'], ['z'], {'meson-dep': 'zlib'}],
- 
-   # Libraries with preconditions
-   ['vaapi_drm', ['va/va.h', 'va/va_drm.h'], ['vaGetDisplayDRM'], ['va', 'va-drm'],
-@@ -1930,6 +1930,7 @@ foreach check : all_checks
-     prefix = ''
- 
-     found = true
-+    skipchecks = false
- 
-     preconditions = opts.get('preconditions', [])
- 
-@@ -1985,6 +1986,11 @@ foreach check : all_checks
-             req = false
-           endif
-           dep = cc.find_library(link_with, required : req)
-+          if not dep.found() and opts.has_key('meson-dep')
-+            dep = dependency(opts.get('meson-dep'), required: false)
-+            # We can't do compiler checks for non-external dependencies, so skip them and trust the meson dependency
-+            skipchecks = true
-+          endif
-           found = found and dep.found()
-           extra_deps += dep
-         endforeach
-@@ -2014,7 +2020,8 @@ foreach check : all_checks
-         else
-           dep = dependency(pkg_name, required : req)
-         endif
--        found = dep.found() and dep.type_name() != 'internal'
-+        found = dep.found()
-+        skipchecks = dep.type_name() == 'internal'  # same here, trust the meson dependency
-         extra_deps += dep
-       endif
-     endif
-@@ -2028,14 +2035,14 @@ foreach check : all_checks
-         endif
- 
-         if not conf.has(header.underscorify())
--          has_header = cc.has_header(header, dependencies: extra_deps)
-+          has_header = skipchecks or cc.has_header(header, dependencies: extra_deps)
-           conf.set10(header.underscorify().to_lower(), has_header)
-           found = found and has_header
-         endif
-       endforeach
-     endif
- 
--    if found
-+    if found and not skipchecks
-       n_funcs_found = 0
-       foreach symbol : funcs
-         if check_type == 'header-func'
-@@ -2055,7 +2062,7 @@ foreach check : all_checks
-       endif
-     endif
- 
--    if found
-+    if found and not skipchecks
-       n_defines_found = 0
-       foreach symbol : defines
-         if cc.get_define(symbol, dependencies : extra_deps, prefix: prefix, args : c_args + project_c_args) != ''
-@@ -2065,15 +2072,15 @@ foreach check : all_checks
-       found = n_defines_found == defines.length()
-     endif
- 
--    if found and compiles != ''
-+    if found and compiles != '' and not skipchecks
-       found = cc.compiles('\n\n'.join([prefix, compiles]), dependencies : extra_deps, args : c_args + project_c_args, name: name)
-     endif
- 
--    if found and links != ''
-+    if found and links != '' and not skipchecks
-       found = cc.links('\n\n'.join([prefix, links]), dependencies : extra_deps, args : c_args + project_c_args, name: name)
-     endif
- 
--    if found and type != ''
-+    if found and type != '' and not skipchecks
-       found = cc.has_type(type, prefix : prefix, dependencies : extra_deps, args : c_args + project_c_args)
-     endif
- 
-@@ -3103,6 +3110,11 @@ foreach a: arch_list
- endforeach
- 
- foreach have: have_list
-+  if have == 'unistd_h' and conf.get(have) == 0
-+    # an atrocious hack to get this working with the zlib subproject on windows...
-+    # zlib also uses a HAVE_UNISTD_H define, but it checks it with #ifdef and not #if
-+    continue
-+  endif
-   final_conf.set('HAVE_@0@'.format(have.to_upper()), conf.get(have.to_lower()))
- endforeach
-