pgsql: If we're gonna provide an --enable-profiling configure option,

Log Message:
-----------
If we're gonna provide an --enable-profiling configure option, surely
it ought to know that you need -DLINUX_PROFILE on Linux.

Modified Files:
--------------
    pgsql:
        configure (r1.560 -> r1.561)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.560&r2=1.561)
        configure.in (r1.526 -> r1.527)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.526&r2=1.527)
    pgsql/src/include:
        pg_config.h.in (r1.121 -> r1.122)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in?r1=1.121&r2=1.122)
    pgsql/src/template:
        linux (r1.29 -> r1.30)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/template/linux?r1=1.29&r2=1.30)