[Patch-gnuradio] minor fixes for Windows

[Don Ward]

Two minor fixes:

(1) Close out_f before removing it in 
gnuradio-core/src/python/gnuradio/gr/qa_wavefile.py (to prevent make check 
failure).

(2) Don't permanently change PATH in config/sdl.m4 (to prevent real problems 
in MinGW and potential problems for any code that runs after sdl.m4 and 
depends on PATH).

-- Don W.

qa_wavefile_py.patch
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sdl_m4.patch
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