cmake files installation directory

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For now, *cmake files are installed in ${CMAKE_INSTALL_PREFIX}/share/libmemcached/cmake

Common practice is ${CMAKE_INSTALL_LIBDIR}/cmake/libmemcached

$ ll /usr/lib64/cmake
total 368
drwxr-xr-x. 2 root root 4096 13 déc.  08:17 Breeze
drwxr-xr-x. 2 root root 4096  2 déc.  08:03 bson-1.0
drwxr-xr-x. 2 root root 4096 29 nov.  07:26 c-ares
drwxr-xr-x. 2 root root 4096 17 nov.  10:20 check
drwxr-xr-x. 2 root root 4096 17 nov.  10:16 clang
-rw-r--r--. 1 root root 3577  7 août  15:20 cmark.cmake
-rw-r--r--. 1 root root 1620  7 août  15:20 cmark-release.cmake
drwxr-xr-x. 2 root root 4096 17 nov.  10:10 DBus1
drwxr-xr-x. 2 root root 4096 17 nov.  10:18 dlib
drwxr-xr-x. 2 root root 4096 17 nov.  10:11 fftw3
drwxr-xr-x. 2 root root 4096 17 nov.  10:18 FreeGLUT
drwxr-xr-x. 2 root root 4096 17 nov.  10:21 GEOS
drwxr-xr-x. 2 root root 4096 17 nov.  10:19 gflags
drwxr-xr-x. 2 root root 4096 17 nov.  10:19 GTest
drwxr-xr-x. 2 root root 4096 27 nov.  07:09 GtkDoc
drwxr-xr-x. 2 root root 4096 17 nov.  10:23 harfbuzz
drwxr-xr-x. 2 root root 4096 10 déc.  08:55 hdr_histogram
drwxr-xr-x. 2 root root 4096 17 nov.  10:22 json-c
...

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Thanks!