configure.ac: replace bogus 'test x = x' with 'true'
configure.ac: replace bogus 'test x = x' with 'true'

...it should have been 'test x == x', anyway :-P

Signed-off-by: Michael Ira Krufky <00524723a60798c74a43fcc620c25dd7b9ece078@linuxtv.org>

mkrufky/libdvbtee,mkrufky/libdvbtee,mkrufky/libdvbtee,mkrufky/libdvbtee,mkrufky/libdvbtee