CMake: Added 'DROPOUT_DL_TESTS' Option

If not set tests will not be build.

CMakeLists.txt

@@ -11,7 +11,7 @@ find_library(SQLITE3_FOUND sqlite3)
 find_library(GCRYPT_FOUND gcrypt)
 IF (SQLITE3_FOUND)
     message(STATUS "sqlite3 found")
-    target_link_libraries(dropout-dl curl sqlite3)
+    target_link_libraries(dropout-dl sqlite3)
     add_compile_definitions(DROPOUT_DL_SQLITE)
 ENDIF()
 IF(GCRYPT_FOUND)
@@ -19,7 +19,6 @@ IF(GCRYPT_FOUND)
     target_link_libraries(dropout-dl gcrypt)
     add_compile_definitions(DROPOUT_DL_GCRYPT)
 ENDIF()
-
-# IF(DROPOUT_BUILD_TESTS)
+IF(DROPOUT_DL_TESTS)
     add_subdirectory(tests)
-# ENDIF()
+ENDIF()