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set c_std to C11 due to unnamed union in drm_mode.h

In the drm_mode.h header there is this unnamed union:

/**
 * @hdmi_metadata_type1: HDR Metadata Infoframe.
 */
union {
	struct hdr_metadata_infoframe hdmi_metadata_type1;
};

Unnamed structs/union are a C11 feature, but in meson.build c_std is set to C99. Since this is only a header there are no "real" consequences, but when including libdrm as a subproject (for example from Meson's wrapdb), this can cause the compilation to break when compiled with Werror like in libliftoff.

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