fix: set public compiler flags on library targets

POCO_STATIC: has to be set when using poco as static library
POCO_NO_ATUMATIC_LIBS: CMake config module will find the correct libraries.
  Don't need to guess in headers.

Data/MySQL/CMakeLists.txt

@@ -27,6 +27,7 @@ target_include_directories( "${LIBNAME}"
         $<INSTALL_INTERFACE:include>
     PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src
     )
+target_compile_definitions("${LIBNAME}" PUBLIC ${LIB_MODE_DEFINITIONS})
 
 POCO_INSTALL("${LIBNAME}")
 POCO_GENERATE_PACKAGE("${LIBNAME}")