[committed, obvious] gdb/testsuite: fix TCL error in py-format-string.exp

[Sandra Loosemore]

When GDB is built without python support, I've been seeing this TCL error:

(gdb) UNSUPPORTED: gdb.python/py-format-string.exp: format_string: 
lang_c: Python support is disabled.
ERROR: tcl error sourcing 
/path/to/gdb/testsuite/gdb.python/py-format-string.exp.
ERROR: invoked "continue" outside of a loop

The test for python support is the same one being used in all the 
gdb.python tests, it is just in the wrong place, inside a function 
instead of at top level, where it cannot meaningfully "continue".  I've 
fixed it by moving the test earlier in the file, outside the function.

I think this is sufficiently obvious that I've gone ahead and checked in 
this patch.

-Sandra
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