fix compile warnings

[tpoisonooo]

TNN/include/tnn/utils/blob_converter.h

Line 54 in 77ccc40

DEPRECATED("use Mat(DeviceType, MatType, DimsVector, void*) instead");

linux 交叉编译 android 会报大量的 warning.

/GitProjects/TNN/include/tnn/utils/blob_converter.h:54:5: warning: declaration does not declare anything [-Wmissing-declarations]
    __attribute__((deprecated ("use Mat(DeviceType, MatType, DimsVector, void*) instead")));
    ^

这个是想做个#error还是只是想单纯的__attribute__((deprecated)) 一个接口？

[darrenyao87]

Mat的接口是开源前刚定好，担心评测出问题，没有统一到新接口。正式开源前会统一去掉旧接口

[neiltian-tencent]

这个是deprecated用错提示warning，3e27d76 fix。