* gnu/packages/patches/netsurf-longer-test-timeout.patch, gnu/packages/patches/netsurf-y2038-tests.patch: New patches. * gnu/local.mk (dist_patch_DATA): Add them. * gnu/packages/web.scm (netsurf)[source]: Use them. [native-inputs]: Add libidn, check. [inputs]: Add miscfiles. [arguments]: Remove #:tests?, add #:test-target. Add 'patch-check phase.