Add #define to get printf-format specifiers.
Add #define to get printf-format specifiers.

This is needed on older compilers/stdlibs such as on Ubuntu Precise
which is used on Travis.

atetubou/ninja,iwadon/ninja,lizh06/ninja,atetubou/ninja,mydongistiny/ninja,bradking/ninja,fuchsia-mirror/third_party-ninja,lizh06/ninja,ninja-build/ninja,ninja-build/ninja,martine/ninja,ndsol/subninja,sgraham/ninja,iwadon/ninja,iwadon/ninja,lizh06/ninja,Qix-/ninja,nico/ninja,ndsol/subninja,sgraham/ninja,iwadon/ninja,mydongistiny/ninja,mydongistiny/ninja,martine/ninja,maruel/ninja,maruel/ninja,ninja-build/ninja,nicolasdespres/ninja,AoD314/ninja,bradking/ninja,ndsol/subninja,lizh06/ninja,martine/ninja,sgraham/ninja,fuchsia-mirror/third_party-ninja,maruel/ninja,martine/ninja,ndsol/subninja,mydongistiny/ninja,Qix-/ninja,maruel/ninja,nicolasdespres/ninja,nicolasdespres/ninja,AoD314/ninja,bradking/ninja,atetubou/ninja,AoD314/ninja,nico/ninja,sgraham/ninja,nico/ninja,nico/ninja,AoD314/ninja,bradking/ninja,Qix-/ninja,Qix-/ninja,fuchsia-mirror/third_party-ninja,nicolasdespres/ninja,fuchsia-mirror/third_party-ninja,ninja-build/ninja,atetubou/ninja