package/wpewebkit: new package

package/wpewebkit: new package

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Reviewed-by: Adrian Perez de Castro <aperez@igalia.com>
[Thomas:
 - add missing depends on BR2_HOST_GCC_AT_LEAST_4_8
 - improve comments on depends on
 - add missing "comment" for toolchain dependencies
 - add missing "depends on BR2_PACKAGE_WPEWEBKIT_ARCH_SUPPORTS" on the
   Config.in comment
 - add missing "select BR2_PACKAGE_WAYLAND", which is needed to select
   BR2_PACKAGE_WAYLAND_PROTOCOLS
 - fix typoes in the JIT enabling code that was using
   WEBKITGTK_CONF_OPTS instead of WPEWEBKIT_CONF_OPTS]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>