fate: simplify fft test rules

Signed-off-by: Mans Rullgard <mans@mansr.com>

tests/fate/fft.mak

-FATE_FFT += fate-fft
-fate-fft: libavcodec/fft-test$(EXESUF)
-fate-fft: CMD = run libavcodec/fft-test
+FATE_FFT = fate-fft   fate-ifft   \
+           fate-mdct  fate-imdct  \
+           fate-rdft  fate-irdft  \
+           fate-dct1d fate-idct1d
 
-FATE_FFT += fate-ifft
-fate-ifft: libavcodec/fft-test$(EXESUF)
+fate-fft:    CMD = run libavcodec/fft-test
 fate-ifft:   CMD = run libavcodec/fft-test -i
-
-FATE_FFT += fate-mdct
-fate-mdct: libavcodec/fft-test$(EXESUF)
 fate-mdct:   CMD = run libavcodec/fft-test -m
-
-FATE_FFT += fate-imdct
-fate-imdct: libavcodec/fft-test$(EXESUF)
 fate-imdct:  CMD = run libavcodec/fft-test -m -i
-
-FATE_FFT += fate-rdft
-fate-rdft: libavcodec/fft-test$(EXESUF)
 fate-rdft:   CMD = run libavcodec/fft-test -r
-
-FATE_FFT += fate-irdft
-fate-irdft: libavcodec/fft-test$(EXESUF)
 fate-irdft:  CMD = run libavcodec/fft-test -r -i
-
-FATE_FFT += fate-dct1d
-fate-dct1d: libavcodec/fft-test$(EXESUF)
 fate-dct1d:  CMD = run libavcodec/fft-test -d
-
-FATE_FFT += fate-idct1d
-fate-idct1d: libavcodec/fft-test$(EXESUF)
 fate-idct1d: CMD = run libavcodec/fft-test -d -i
 
-FATE_TESTS += $(FATE_FFT)
 fate-fft-test: $(FATE_FFT)
+$(FATE_FFT): libavcodec/fft-test$(EXESUF)
 $(FATE_FFT): REF = /dev/null
 
 FATE_FFT_FIXED = fate-fft-fixed  fate-ifft-fixed  \
@@ -46,4 +28,4 @@ fate-fft-fixed-test: $(FATE_FFT_FIXED)
 $(FATE_FFT_FIXED): libavcodec/fft-fixed-test$(EXESUF)
 $(FATE_FFT_FIXED): REF = /dev/null
 
-FATE_TESTS += $(FATE_FFT_FIXED)
+FATE_TESTS += $(FATE_FFT) $(FATE_FFT_FIXED)