fixed test/Makefile line 137 missing ')'

[razor7788]

i use cmd： make KISSFFT_DATATYPE=int16_t KISSFFT_STATIC=1 testsingle

then Error occur like this： DFIXED_POINT=16 twotonetest.c -L.. -lkissfft-int16_t -lm Makefile:133: ======attempting to build FFTW benchmark Makefile:134: *** unterminated call to function 'warning': missing ')'. Stop. make[1]: Leaving directory '/home/jxwang/WorkSpace/kissfft/kissfft/test' make: *** [Makefile:263: testsingle] Error 2

open test/Makefile , notice that Line 137:

$(warning WARNING: No FFTW development files found! FFTW not available for comparison!0

Ok , problem is obvious. '0' is took ')' place

[basilgello]

Yeah, I ran all the testsuite with FFTW library in place, so I did not catch it!