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The header sparcisr.h is part of the ABI and may be included by code which
does not define RTEMS_4_8_EDISOFT yet uses 4.8 Edisoft.  In such cases the
definition of sparc_install_ta_3_window_flush_isr will be inconsistent.  So
just make this function always available, and provide the correct
definition in the .c file (which must have RTEMS_4_8_EDISOFT defined if
that toolchain is used).

The base location of TBR may be different from 0x40000000.

This adds the standard window-flush ISR to Edisoft RTEMS 4.8 builds,
allowing the custom SPARC setjmp/longjmp implementation to use "ta 3" to
instigate a window flush.  For non-Edisoft builds "ta 3" can be used
without any special additions because it already exists.  For Edisoft
builds the function sparc_install_ta_3_window_flush_isr() must be called
before any MicroPython functions are called, in order to install the custom
handler.

With this patch the implementation of sparc_window_flush_trap_handler
matches the standard implementation.