Fix MythZoneMinder part #2

6bfda0c actually broke compilation using the old osx-packager.pl build script.
Alternatively, I find that mythzoneminder now compiles on my linux PC, when it never did before.

mythplugins/mythzoneminder/mythzmserver/mythzmserver.pro

@@ -10,16 +10,15 @@ target.path = $${PREFIX}/bin
 
 INSTALLS = target
 
+MYSQLIBS = "$$system(mysql_config --libs)"
 macx {
     CONFIG += qt
     QT += sql
     #Can't use mysql_config output, as it could have been compiled with
     # universal support, and we may want just 32 or 64 bits
-    LIBS += -lmysqlclient
-}
-else {
-    LIBS += $$system(mysql_config --libs)
+    MYSQLIBS ~= s/-arch +[a-z0-9_]+//g
 }
+LIBS += $$MYSQLIBS
 
 linux: DEFINES += linux