Remove define causing a warning
These lines were added in commit 25beb8d01b in 2008 to provide
compatibility with GCC 3.4 which clearly does not support C++11.
(The warning is visible since commit b96b6334c0 which put system
headers last, so that the define is already provided transitvely.)
Diff:
Passes make, make check and a full make doc.
Patch on countdown for May 9th
Patch counted down - please push