fdo#60907 Use *one* variable for the MySQL library file

as opposed to two with different values,
which leads to trouble

Change-Id: Ic603105187b6078bd46d6c253410af28e188c70f

mysqlc/Library_mysqlc.mk

@@ -35,15 +35,13 @@ $(eval $(call gb_Library_use_libraries,mysqlc,\
 	cppuhelper \
 ))
 
-MYSQL_LIBFILE :=$(if $(filter WNT,$(OS)),libmysql.dll,$(if $(filter MACOSX,$(OS)),libmysql.16.dylib,libmysql.so.16))
-
 $(eval $(call gb_Library_add_defs,mysqlc,\
 	-DCPPDBC_EXPORTS \
 	-DCPPCON_LIB_BUILD \
 	-DMYSQLC_VERSION_MAJOR=$(MYSQLC_MAJOR) \
 	-DMYSQLC_VERSION_MINOR=$(MYSQLC_MINOR) \
 	-DMYSQLC_VERSION_MICRO=$(MYSQLC_MICRO) \
-	$(if $(filter NO,$(SYSTEM_MYSQL)),-DMYSQL_LIB=\"$(MYSQL_LIBFILE)\") \
+	$(if $(filter NO,$(SYSTEM_MYSQL)),-DMYSQL_LIB=\"$(LIBMYSQL)\") \
 	$(if $(filter NO,$(SYSTEM_MYSQL_CPPCONN)),\
 	-DCPPCONN_LIB=\"$(call gb_Library_get_runtime_filename,mysqlcppconn)\") \
 ))