Fix CMake compilation of redis++ as sub project from FetchContent (#611)

Author: sjanel

CMakeLists.txt

@@ -216,7 +216,6 @@ if(REDIS_PLUS_PLUS_BUILD_STATIC)
             $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${TLS_SUB_DIR}>
             $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${CXX_UTILS_DIR}>
             $<INSTALL_INTERFACE:include>
-        PRIVATE
             $<BUILD_INTERFACE:${REDIS_PLUS_PLUS_GENERATED_HEADER_DIR}>)
 
     if(hiredis_FOUND)
@@ -270,7 +269,6 @@ if(REDIS_PLUS_PLUS_BUILD_SHARED)
             $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${TLS_SUB_DIR}>
             $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${CXX_UTILS_DIR}>
             $<INSTALL_INTERFACE:include>
-        PRIVATE
             $<BUILD_INTERFACE:${REDIS_PLUS_PLUS_GENERATED_HEADER_DIR}>)
 
     if(hiredis_FOUND)