build: Move epoll dependency check
DragonFly and OpenBSD rely on epoll-shim to provide eventfd. Move the check for epoll dependency to the root meson.build script so that we can use that for the <sys/evenfd.h> check as well. This is preparation work for the following commits, no functional change intended at this point. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1642>
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					@ -505,6 +505,12 @@ else
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    build_dri2 = get_option('dri2') == 'true'
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					    build_dri2 = get_option('dri2') == 'true'
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endif
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					endif
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					if host_machine.system() in ['freebsd', 'openbsd']
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					   epoll_dep = dependency('epoll-shim')
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					else
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					   epoll_dep = []
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					endif
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have_eventfd = cc.has_header('sys/eventfd.h')
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					have_eventfd = cc.has_header('sys/eventfd.h')
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if get_option('dri3') == 'auto'
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					if get_option('dri3') == 'auto'
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    build_dri3 = dri3proto_dep.found() and xshmfence_dep.found() and libdrm_dep.found() and have_eventfd
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					    build_dri3 = dri3proto_dep.found() and xshmfence_dep.found() and libdrm_dep.found() and have_eventfd
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					@ -16,12 +16,6 @@ hdrs_present = [
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    'presentext.h',
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					    'presentext.h',
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]
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					]
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if host_machine.system() in ['freebsd', 'openbsd']
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   epoll_dep = dependency('epoll-shim')
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else
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   epoll_dep = []
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endif
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libxserver_present = static_library('libxserver_present',
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					libxserver_present = static_library('libxserver_present',
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    srcs_present,
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					    srcs_present,
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    include_directories: inc,
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					    include_directories: inc,
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