Potential bug in the cmake files.

[wangzhen11aaa]

Description: Some variables are not matched in cmake files.
e.g:

1. FindNUMA.cmake: line 19-21 marked_as_advanced(NUMA_LIBRARIES, NUMA_INCLUDE_DIRS), while in the CMakeLists.txt. line 374, use include_directories(${NUMA_INCLUDE_DIR}). which is not correct.
2. Findzstd.cmake line 21, CMakeLists.txt line 169.

Although cmake will correctly load the header in the default search path, but it makes people confused.

Expected behavior

CMakeLists.txt: line 374
include_directories(${NUMA_INCLUDE_DIRS})

Actual behavior

include_directories(${NUMA_INCLUDE_DIR})

Steps to reproduce the behavior