CMake: Provide proper interface targets from dependencies

* to make use of cmakes inherited link dependencies which
  imports all include directories/ definitions from the link library

(cherry picked from commit 1a572d2425)

CMakeLists.txt

@@ -8,11 +8,13 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
+# We require CMake >= 3.0
+cmake_minimum_required(VERSION 3.0)
+
 # Set projectname (must be done AFTER setting configurationtypes)
 project(TrinityCore)
 
 # CMake policies (can not be handled elsewhere)
-cmake_minimum_required(VERSION 2.8.9)
 cmake_policy(SET CMP0005 OLD)
 if(POLICY CMP0043)
   cmake_policy(SET CMP0043 OLD) # Disable 'Ignore COMPILE_DEFINITIONS_<Config> properties'
@@ -22,6 +24,9 @@ endif(POLICY CMP0043)
 set(CMAKE_DISABLE_SOURCE_CHANGES ON)
 set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
 
+# build static libraries
+set(BUILD_SHARED_LIBS OFF)
+
 # Set RPATH-handing (CMake parameters)
 set(CMAKE_SKIP_BUILD_RPATH 0)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH 0)
@@ -52,22 +57,9 @@ include(CheckPlatform)
 
 include(GroupSources)
 
-# basic packagesearching and setup (further support will be needed, this is a preliminary release!)
-set(OPENSSL_EXPECTED_VERSION 1.0.0)
-
 find_package(PCHSupport)
-find_package(OpenSSL REQUIRED)
-find_package(Threads REQUIRED)
 find_package(MySQL)
 
-include(ConfigureBoost)
-
-if( UNIX )
-  find_package(Readline)
-  find_package(ZLIB)
-  find_package(BZip2)
-endif()
-
 if(NOT WITHOUT_GIT)
   find_package(Git)
 endif()