webkitgtk: Use gcc to compile for arm target

webkitgtk: Use gcc to compile for arm target

Builds with clang run into compiler errors

<inline asm>:320:1: error: Relocation Not In Range
  320 | movw r4, #:lower16:.Lllint_op_tail_call_varargs - .Lllint_relativePCBase
      | ^

(From OE-Core rev: be459bf17d5e47c51d96da1a571de01790c277b9)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>