ENH: make linker flags use init values so users can set them from the cache

Modules/Platform/Windows-cl.cmake

@@ -83,9 +83,9 @@ SET (CMAKE_LINK_DEF_FILE_FLAG "/DEF:")
 SET (CMAKE_EXE_LINKER_FLAGS_INIT "/STACK:10000000 /machine:I386 /INCREMENTAL:YES")
 SET (CMAKE_EXE_LINKER_FLAGS_DEBUG_INIT "/debug /pdbtype:sept")
 SET (CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO_INIT "/debug /pdbtype:sept")
-SET (CMAKE_SHARED_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS_INIT})
-SET (CMAKE_SHARED_LINKER_FLAGS_DEBUG ${CMAKE_EXE_LINKER_FLAGS_DEBUG_INIT})
-SET (CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO ${CMAKE_EXE_LINKER_FLAGS_DEBUG_INIT})
-SET (CMAKE_MODULE_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS}
-SET (CMAKE_MODULE_LINKER_FLAGS_DEBUG ${CMAKE_MODULE_LINKER_FLAGS_DEBUG})
-SET (CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO ${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO_INIT})
+SET (CMAKE_SHARED_LINKER_FLAGS_INIT ${CMAKE_EXE_LINKER_FLAGS_INIT})
+SET (CMAKE_SHARED_LINKER_FLAGS_DEBUG_INIT ${CMAKE_EXE_LINKER_FLAGS_DEBUG_INIT})
+SET (CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO_INIT ${CMAKE_EXE_LINKER_FLAGS_DEBUG_INIT})
+SET (CMAKE_MODULE_LINKER_FLAGS_INIT ${CMAKE_SHARED_LINKER_FLAGS}
+SET (CMAKE_MODULE_LINKER_FLAGS_DEBUG_INIT ${CMAKE_MODULE_LINKER_FLAGS_DEBUG})
+SET (CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO_INIT ${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO_INIT})