Win32/MSVC: garbage-collect symbols even in debug builds.

This shrinks debug build binaries by ~1/3.

src/CMakeLists.txt

@@ -224,7 +224,7 @@ target_link_libraries(solvespace
 
 if(MSVC)
     set_target_properties(solvespace PROPERTIES
-        LINK_FLAGS "/MANIFEST:NO /SAFESEH:NO")
+        LINK_FLAGS "/MANIFEST:NO /SAFESEH:NO /INCREMENTAL:NO /OPT:REF")
 endif()
 
 # solvespace headless library
@@ -263,6 +263,11 @@ target_link_libraries(solvespace-cli
 add_dependencies(solvespace-cli
     resources)
 
+if(MSVC)
+    set_target_properties(solvespace-cli PROPERTIES
+        LINK_FLAGS "/INCREMENTAL:NO /OPT:REF")
+endif()
+
 # solvespace unix package
 
 if(NOT (WIN32 OR APPLE))