Botan: Fix MSVC warning
Botan: Fix MSVC warning

botan.cpp:35140: warning: C4297: 'Botan::bigint_sub2_rev' : function assumed not to throw an exception but does
The function is extern "C" and /EHc was specified

-EHsc (specified in Qt mkspecs) means that the compiler can assume that
extern "C" functions do not throw exceptions.

-EHs is equivalent, only without this assumption

Change-Id: I5eae79bfbd647c296626c03636775f6057faf385
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@digia.com>

farseerri/git_code,AltarBeastiful/qt-creator,kuba1/qtcreator,AltarBeastiful/qt-creator,darksylinc/qt-creator,darksylinc/qt-creator,omniacreator/qtcreator,xianian/qt-creator,danimo/qt-creator,maui-packages/qt-creator,amyvmiwei/qt-creator,Distrotech/qtcreator,colede/qtcreator,farseerri/git_code,danimo/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,kuba1/qtcreator,darksylinc/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,omniacreator/qtcreator,colede/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,danimo/qt-creator,colede/qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,omniacreator/qtcreator,maui-packages/qt-creator,colede/qtcreator,omniacreator/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,kuba1/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,xianian/qt-creator,danimo/qt-creator,kuba1/qtcreator,amyvmiwei/qt-creator,Distrotech/qtcreator,colede/qtcreator,amyvmiwei/qt-creator,xianian/qt-creator,omniacreator/qtcreator,darksylinc/qt-creator,Distrotech/qtcreator,xianian/qt-creator,danimo/qt-creator,omniacreator/qtcreator,danimo/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,colede/qtcreator,Distrotech/qtcreator,kuba1/qtcreator,darksylinc/qt-creator,martyone/sailfish-qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,darksylinc/qt-creator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,maui-packages/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,farseerri/git_code,kuba1/qtcreator,omniacreator/qtcreator,maui-packages/qt-creator,xianian/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,farseerri/git_code,kuba1/qtcreator,maui-packages/qt-creator,darksylinc/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,farseerri/git_code,kuba1/qtcreator,Distrotech/qtcreator,darksylinc/qt-creator,colede/qtcreator