[0.21.0] Build failure on RPi3

[Narrat]

Building the latest release (0.21.0) on a RPi3 running Arch Linux ARM fails with the following error message:

[197/481] Compiling video/out/opengl/context_x11.c
../video/out/opengl/context_rpi.c: In Funktion »rpi_control«:
../video/out/opengl/context_rpi.c:316:9: Fehler: operand type »_Atomic atomic_bool * {aka _Atomic _Bool *}« is incompatible with argument 1 of »__atomic_fetch_and«
         if (atomic_fetch_and(&p->reload_display, 0)) {
         ^~

Waf: Leaving directory `/home/omnius/Builds/ALARM/community/mpv/src/mpv-0.21.0/build'
Build failed
 -> task in 'objects' failed (exit status 1): 
    {task 1980410160: c context_rpi.c -> context_rpi.c.14.o}
['/usr/lib/hardening-wrapper/bin/cc', '-fPIC', '-D_ISOC99_SOURCE', '-D_GNU_SOURCE', '-D_LARGEFILE_SOURCE', '-D_FILE_OFFSET_BITS=64', '-D_LARGEFILE64_SOURCE', '-std=c99', '-Wall', '-O2', '-g', '-Werror=implicit-function-declaration', '-Wno-error=deprecated-declarations', '-Wno-error=unused-function', '-Wempty-body', '-Wdisabled-optimization', '-Wstrict-prototypes', '-Wno-format-zero-length', '-Werror=format-security', '-Wno-redundant-decls', '-Wall', '-Wundef', '-Wmissing-prototypes', '-Wshadow', '-Wno-switch', '-Wparentheses', '-Wpointer-arith', '-Wno-pointer-sign', '-Wno-unused-result', '-isystem/opt/vc/include/', '-isystem/opt/vc/include/interface/vcos/pthreads', '-isystem/opt/vc/include/interface/vmcs_host/linux', '-fgnu89-inline', '-pthread', '-I/home/omnius/Builds/ALARM/community/mpv/src/mpv-0.21.0/build', '-I/home/omnius/Builds/ALARM/community/mpv/src/mpv-0.21.0', '-I/usr/include/libdrm', '-I/usr/include/samba-4.0', '-I/usr/include/lua5.2', '-I/usr/include/alsa', '-I/usr/include/freetype2', '-I/usr/include/libpng16', '-I/usr/include/harfbuzz', '-I/usr/include/glib-2.0', '-I/usr/lib/glib-2.0/include', '-I/usr/include/fribidi', '-DHAVE_DVDREAD=1', '-DHAVE_JACK=1', '-DHAVE_LIBSWRESAMPLE=1', '-DHAVE_CDDA=1', '-DHAVE_EGL_X11=1', '-DHAVE_LCMS2=1', '-DHAVE_CACA=1', '-DHAVE_VAAPI_WAYLAND=1', '-DHAVE_LIBV4L2=1', '-DHAVE_XEXT=1', '-DHAVE_RUBBERBAND=1', '-DPATH_DEV_DSP="/dev/dsp"', '-DPATH_DEV_MIXER="/dev/mixer"', '-DHAVE_GBM=1', '-DHAVE_LIBAVDEVICE=1', '-DHAVE_VAAPI=1', '-DHAVE_DRM=1', '-DHAVE_GL_WAYLAND=1', '-DHAVE_EGL_DRM=1', '-DHAVE_EGL_DRM=1', '-DHAVE_LIBAVFILTER=1', '-DHAVE_VDPAU=1', '-DHAVE_VAAPI_DRM=1', '-DHAVE_LIBSMBCLIENT=1', '-DHAVE_X11=1', '-DHAVE_PULSE=1', '-D_REENTRANT', '-DHAVE_DVDNAV=1', '-DHAVE_52ARCH=1', '-DHAVE_XRANDR=1', '-DHAVE_VAAPI_X11=1', '-DHAVE_LIBBLURAY=1', '-DHAVE_XSS=1', '-DHAVE_WAYLAND=1', '-DHAVE_LIBAV=1', '-DHAVE_XV=1', '-DHAVE_ALSA=1', '-DHAVE_XINERAMA=1', '-DHAVE_LIBASS=1', '../video/out/opengl/context_rpi.c', '-c', '-o', '/home/omnius/Builds/ALARM/community/mpv/src/mpv-0.21.0/build/video/out/opengl/context_rpi.c.14.o']

[ghost]

The commit above is untested, but should work.

[Narrat]

I tried it and it worked fine.