vchoi_fork

[svn-r7404] Purpose:
    Bug fix

Description:
    Correct problem with mis-aligned string pointers on certain architectures
    (i.e. on modi4) causing a core dump.  The string pointers can be mis-aligned
    due to being part of a compound datatype and how our compound type conversion
    routines work.

Solution:
    Allocate string with temporary variable and memcpy() the pointer to the
    new string into the type conversion buffer, instead of dereferencing the type
    conversion buffer directly.

Platforms tested:
    FreeBSD 4.8 (sleipnir)
    h5committest