libpam: Fix patch broken during upgrade

"0x200" became "0200" during the upgrade to libpam 1.2.1 in:
http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=88dd997d9941b63ae9eead6690ecf2b785c0740c


and this broke the IMAGE_FEATURES like debug-tweaks.

I've converted all the values to octal here to match the original
header file convention and make it clearer.

[YOCTO #8033]

(From OE-Core rev: 588e19058f631a1cc78002e1969a5459cd626afb)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>