Fix detection error in configure.ac

[Thomas Zimmermann]

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Hi there,

this patch fixes a detection error in configure.ac.

'Xrandr' and 'Xinerama' detection fails if GCC is set to Ansi mode.
The reason is the use of 'typeof' in the test. GCC does not support
this keyword when it is in Ansi mode. The patch solves that problem by
using __typeof__ instead. I tested the patch on my machine.

Changelog:
    configure.ac: Fix detection error when in Ansi mode

Regards, Thomas

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