Fixed char.c compilation error in MSVC <= 2012
Fixed char.c compilation error in MSVC <= 2012

Signed-off-by: TungSinpei <5d3f50a5833a474d732bb40b1eda54ecec6e7754@hotmail.com>

Nipol/Siesta,Nipol/Siesta,Nipol/Siesta