uplifted glib.h ordering problem for LSB <5.0

[Jeff Johnson]

A build targeting LSB=4.1 set up this way:

export LSBCC_LSBVERSION=4.1

found problems building against the uplifted glib.h.

Lines 2416 and 2621 reported "field 'mutex' has incomplete type", both are
structure members declared as:

        GStaticMutex mutex;

This is apparently an ordering problem, at line 1879 we see:

#if __LSB_VERSION__ < 50
    typedef struct _GMutex GMutex;

    typedef struct _GStaticMutex GStaticMutex;

#endif /* __LSB_VERSION__ < 5.0 */

but the definition of _GStaticMutex does not come until line 2711:

#if __LSB_VERSION__ < 50
    struct _GStaticMutex {
        struct _GMutex *runtime_mutex;
        union {
            char pad[GLIB_LSB_PADDING_SIZE];
            double dummy_double;
            void *dummy_pointer;
            long int dummy_long;
        } static_mutex;
    };

#endif /* __LSB_VERSION__ < 5.0 */

that is, after the two uses that cause the compiler error messages. Manually
moving this definition up higher in the header clears the problem.