QT_LFLAGS_MYSQL and -Wl,rpath

in src/sql/drivers/mysql/qsql_mysql.pri, the *= operator is used to filter and add QT_LFLAGS_MYSQL to LIBS. When QT_LFLAGS_MYSQL contains multiple -Wl,rpath arguments, all but the first are filtered out, causing the build to fail. On one system, for example, the output of "mysql_config --libs" looks like this:

L/path/to/mariadb-5.2.4/libin -L/path/to/mariadb-5.2.4/lib64 -L/path/to/mariadb-5.2.4/lib -L/path/to/lib -L/path/to/lib64 -Wl,dynamic-linker -Wl,/lib64/ld-linux-x86-64.so.2 -Wl,no-warn-search-mismatch -Wl,-z -Wl,origin -Wl,-enable-new-dtags -Wl,-rpath -Wl,/path/to/mariadb-5.2.4/libin -Wl,-rpath -Wl,/path/to/mariadb-5.2.4/lib64 -Wl,-rpath -Wl,/path/to/mariadb-5.2.4/lib -Wl,-rpath -Wl,/path/to/lib64 -Wl,-rpath -Wl,/path/to/lib -rdynamic -L/path/to/mariadb-5.2.4/lib/mysql -lmysqlclient -lz -lcrypt -lnsl -lm

One solution would be to use += instead of *=