Patch merged into coreboot/master: bab0a0b PDCurses: pdcscrn.c: Use `#ifdef` instead of `#if CONFIG_SPEAKER`

the following patch was just integrated into master:
commit bab0a0b577ba8cc28aa1e2b2e9ec65fb98edced1
Author: Paul Menzel 
Date:   Wed Mar 27 09:50:30 2013 +0100

PDCurses: pdcscrn.c: Use `#ifdef` instead of `#if CONFIG_SPEAKER`

Building libpayload with the PDCurses backend the following warning
    is shown.

/src/coreboot/payloads/libpayload(master) $ make clean
        /src/coreboot/payloads/libpayload(master) $ make
        […]
            CC         curses/pdcurses-backend/pdcscrn.libcurses.o
        curses/pdcurses-backend/pdcscrn.c: In function 'PDC_scr_open':
        curses/pdcurses-backend/pdcscrn.c:75:5: warning: "CONFIG_SPEAKER" is not defined [-Wundef]
        […]

The GCC documentation states [1]

In some contexts this shortcut is undesirable. The -Wundef option
        causes GCC to warn whenever it encounters an identifier which is
        not a macro in an ‘#if’.

and therefore use `#ifdef` [2] to silence this warning. No functional
    change is done, as `CONFIG_SPEAKER` is assigned the value `Y` when
    defined.

There was some discussion going on the list [3], but my points in there
    turned out to be incorrect.

[1] http://gcc.gnu.org/onlinedocs/cpp/If.html
    [2] http://gcc.gnu.org/onlinedocs/cpp/Ifdef.html
    [3] http://www.coreboot.org/pipermail/coreboot/2013-March/075561.html

Change-Id: I8e9c9b5d01985b21ad05018986d614cf9bf2b439
    Signed-off-by: Paul Menzel 
    Reviewed-on: http://review.coreboot.org/2934
    Reviewed-by: Nico Huber 
    Tested-by: build bot (Jenkins)

Build-Tested: build bot (Jenkins) at Mon Apr  1 23:21:22 2013, giving +1
See http://review.coreboot.org/2934 for details.

-gerrit