Partially revert previous commits; ensure the bundle is fixed up correctly

cockatrice/CMakeLists.txt

@@ -183,9 +183,7 @@ add_custom_command(
 )
 
 if(APPLE)
-    # this needs to be relative
-    set(plugin_dest_dir ./cockatrice.app/Contents/Plugins)
-    # instead, this needs an absolute path (for make package to work)
+    set(plugin_dest_dir ${CMAKE_INSTALL_PREFIX}/cockatrice.app/Contents/Plugins)
     set(qtconf_dest_dir ${CMAKE_INSTALL_PREFIX}/cockatrice.app/Contents/Resources)
 
     # note: no codecs in qt5

oracle/CMakeLists.txt

@@ -48,9 +48,7 @@ IF (NOT WIN32 AND NOT APPLE)
 ENDIF (NOT WIN32 AND NOT APPLE)
 
 if(APPLE)
-    # this needs to be relative
-    set(plugin_dest_dir ./oracle.app/Contents/Plugins)
-    # instead, this needs an absolute path (for make)
+    set(plugin_dest_dir ${CMAKE_INSTALL_PREFIX}/oracle.app/Contents/Plugins)
     set(qtconf_dest_dir ${CMAKE_INSTALL_PREFIX}/oracle.app/Contents/Resources)
 
     # note: no codecs in qt5

servatrice/CMakeLists.txt

@@ -55,9 +55,7 @@ elseif(WIN32)
 endif()
 
 if(APPLE)
-    # this needs to be relative
-    set(plugin_dest_dir ./servatrice.app/Contents/Plugins)
-    # instead, this needs an absolute path (for make)
+    set(plugin_dest_dir ${CMAKE_INSTALL_PREFIX}/servatrice.app/Contents/Plugins)
     set(qtconf_dest_dir ${CMAKE_INSTALL_PREFIX}/servatrice.app/Contents/Resources)
 
     # note: no codecs in qt5