mpv: "whitelist" posix-spawn and strnlen subsitition (#2653)

Some of the Android "features" in mpv are useful (or at least, can
be used) in Termux. Whitelist them while we build with --disable-
android.

packages/mpv/android.patch

@@ -0,0 +1,28 @@
+diff --git a/wscript b/wscript
+index 750ce3bd1f..d32c7bf645 100644
+--- a/wscript
++++ b/wscript
+@@ -233,7 +233,7 @@ iconv support use --disable-iconv.",
+         'name': 'posix-spawn-android',
+         'desc': 'spawnp()/kill() Android replacement',
+         'func': check_true,
+-        'deps': 'android && !posix-spawn-native',
++        'deps': '!posix-spawn-native',
+     },{
+         'name': 'posix-spawn',
+         'desc': 'any spawnp()/kill() support',
+diff --git a/wscript_build.py b/wscript_build.py
+index bbe367963f..61bfe312bb 100644
+--- a/wscript_build.py
++++ b/wscript_build.py
+@@ -495,8 +495,8 @@ def build(ctx):
+         ( "osdep/windows_utils.c",               "os-cygwin" ),
+         ( "osdep/mpv.rc",                        "win32-executable" ),
+         ( "osdep/win32/pthread.c",               "win32-internal-pthreads"),
+-        ( "osdep/android/posix-spawn.c",         "android"),
+-        ( "osdep/android/strnlen.c",             "android"),
++        ( "osdep/android/posix-spawn.c" ),
++        ( "osdep/android/strnlen.c" ),
+ 
+         ## tree_allocator
+         "ta/ta.c", "ta/ta_talloc.c", "ta/ta_utils.c"

packages/mpv/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://mpv.io/
 TERMUX_PKG_DESCRIPTION="Command-line media player"
 TERMUX_PKG_VERSION=0.28.2
-TERMUX_PKG_REVISION=1
+TERMUX_PKG_REVISION=2
 TERMUX_PKG_SHA256=aada14e025317b5b3e8e58ffaf7902e8b6e4ec347a93d25a7c10d3579426d795
 TERMUX_PKG_SRCURL=https://github.com/mpv-player/mpv/archive/v${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_DEPENDS="ffmpeg, openal-soft, libandroid-glob"

packages/mpv/strnlen.h.patch

@@ -1,16 +0,0 @@
-diff --git a/osdep/strnlen.h b/osdep/strnlen.h
-index 0a971d0ab0..9a8b2a104d 100644
---- a/osdep/strnlen.h
-+++ b/osdep/strnlen.h
-@@ -19,11 +19,4 @@
- 
- #ifndef MP_OSDEP_STRNLEN
- #define MP_OSDEP_STRNLEN
--
--#ifdef __ANDROID__
--// strnlen is broken on current android ndk, see https://code.google.com/p/android/issues/detail?id=74741
--#include "osdep/android/strnlen.h"
--#define strnlen freebsd_strnlen
--#endif
--
- #endif