Remove Paddle's warning in CentOS
Created by: gangliao
/home/liaogang/github/Paddle/paddle/utils/Flags.h(28): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(29): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(32): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(33): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(41): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(43): warning: using-declaration ignored -- it refers to the current namespace
Done processing /home/liaogang/github/Paddle/paddle/utils/GlobalConstants.h
Total errors found: 0
/home/liaogang/github/Paddle/paddle/utils/Flags.h(28): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(29): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(32): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(33): warning: using-declaration ignored -- it refers to the current namespace
Done processing /home/liaogang/github/Paddle/paddle/utils/Locks.h
Total errors found: 0
/home/liaogang/github/Paddle/paddle/utils/Flags.h(41): warning: using-declaration ignored -- it refers to the current namespace
/home/liaogang/github/Paddle/paddle/utils/Flags.h(43): warning: using-declaration ignored -- it refers to the current namespace