mesa: Fix indirect draw buffer size check on 32-bit systems.

mesa: Fix indirect draw buffer size check on 32-bit systems.

Fixes dEQP-GLES31.functional subtests:
draw_indirect.negative.command_offset_not_in_buffer_signed32_wrap
draw_indirect.negative.command_offset_not_in_buffer_unsigned32_wrap

These tests use really large values that overflow GLsizeiptr, at
which point the buffer size isn't less than "end".

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95138
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Mark Janes <mark.a.janes@intel.com>