Fix example/simple_cache build

Summary:
From PR: https://github.com/facebook/CacheLib/pull/314/files

Making this change internally to avoid the conflicts with submodules.

Reviewed By: pbhandar2

Differential Revision: D59968381

fbshipit-source-id: c6c08d82740bf7f285a28730758762a19c05e920

Author: Jimmy Lu

examples/simple_cache/build.sh

@@ -24,7 +24,7 @@ CLCMAKE="$CLBASE/cachelib/cmake"
 # After ensuring we are in the correct directory, set the installation prefix"
 PREFIX="$CLBASE/opt/cachelib/"
 
-CMAKE_PARAMS="-DCMAKE_INSTALL_PREFIX='$PREFIX' -DCMAKE_MODULE_PATH='$CLCMAKE'"
+CMAKE_PARAMS="-DCMAKE_INSTALL_PREFIX='$PREFIX' -DCMAKE_MODULE_PATH='$CLCMAKE' -DCMAKE_BUILD_TYPE=Debug"
 
 CMAKE_PREFIX_PATH="$PREFIX/lib/cmake:$PREFIX/lib64/cmake:$PREFIX/lib:$PREFIX/lib64:$PREFIX:${CMAKE_PREFIX_PATH:-}"
 export CMAKE_PREFIX_PATH