check: mark two tests are requiring bash

Requirement was removed just before pushing, but it's actually needed
for heredocs (`<<<`).

Signed-off-by: Eric Engestrom <eric@engestrom.ch>

src/egl/egl-entrypoint-check

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 entrypoints=$(grep EGL_ENTRYPOINT "$srcdir"/main/eglentrypoint.h)
 sorted=$(sort <<< "$entrypoints")

src/glx/tests/dispatch-index-check

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 # extract enum definition
 dispatch_list=$(sed '/__GLXdispatchIndex/,/__GLXdispatchIndex/!d' \