Was "[PATCH] libx264: Do not explicitly set X264_API_IMPORTS"

Setting X264_API_IMPORTS only affects msvc builds and it breaks linking to
static builds (although is required for shared builds). This flag is set by
x264 in its pkgconfig as required since build 158
(a615f027ed172e2dd5380e736d487aa858a0c4ff) from July 2019. So this patch
updates configure to require a newer x264 build that correctly sets the
imports flag.

Alternatively we can detect the x264 build version in configure and keep
the fallback of manually setting the flag on older x264 builds that arent
using pkgconfig (to keep the old behaviour) but that requires some complex
configure changes.

Signed-off-by: Matt Oliver <protogonoi@gmail.com>
---
 configure            | 8 +++-----
 libavcodec/libx264.c | 4 ----
 2 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/configure b/configure
index ede8f9777b..b35728aace 100755
--- a/configure
+++ b/configure
@@ -6535,11 +6535,8 @@ enabled libvpx            && {
 enabled libwebp           && {
     enabled libwebp_encoder      && require_pkg_config libwebp "libwebp >=
0.2.0" webp/encode.h WebPGetEncoderVersion
     enabled libwebp_anim_encoder && check_pkg_config libwebp_anim_encoder
"libwebpmux >= 0.4.0" webp/mux.h WebPAnimEncoderOptionsInit; }
-enabled libx264           && { check_pkg_config libx264 x264 "stdint.h
x264.h" x264_encoder_encode ||
-                               { require libx264 "stdint.h x264.h"
x264_encoder_encode "-lx264 $pthreads_extralibs $libm_extralibs" &&
-                                 warn "using libx264 without pkg-config";
} } &&
-                             require_cpp_condition libx264 x264.h
"X264_BUILD >= 118" &&
-                             check_cpp_condition libx262 x264.h
"X264_MPEG2"
+enabled libx264           && check_pkg_config libx264 x264 "stdint.h
x264.h" x264_encoder_encode &&
+                             require_cpp_condition libx264 x264.h
"X264_BUILD >= 158"
 enabled libx265           && require_pkg_config libx265 x265 x265.h
x265_api_get &&
                              require_cpp_condition libx265 x265.h
"X265_BUILD >= 70"
 enabled libxavs           && require libxavs "stdint.h xavs.h"
xavs_encoder_encode "-lxavs $pthreads_extralibs $libm_extralibs"
diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 21f434d06d..efbc9608c7 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -34,10 +34,6 @@
 #include "atsc_a53.h"
 #include "sei.h"

-#if defined(_MSC_VER)
-#define X264_API_IMPORTS 1
-#endif
-
 #include <x264.h>
 #include <float.h>
 #include <math.h>
--