fate: remove the fate-aac-ltp-encode test

It tests a useless profile which sounds no better than regular aac and which
takes extremely long to encoder something. Also it has been behind experimental
flag for as long as it has been supported.
Should be removed altogether sometime in the future.

tests/fate/aac.mak

@@ -212,15 +212,6 @@ fate-aac-ms-encode: CMP_TARGET = 558
 fate-aac-ms-encode: SIZE_TOLERANCE = 3560
 fate-aac-ms-encode: FUZZ = 15
 
-FATE_AAC_ENCODE += fate-aac-ltp-encode
-fate-aac-ltp-encode: CMD = enc_dec_pcm adts wav s16le $(TARGET_SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav -strict -2 -c:a aac -profile:a aac_ltp -aac_pns 0 -aac_is 0 -aac_ms 0 -aac_tns 0 -b:a 36k -fflags +bitexact -flags +bitexact
-fate-aac-ltp-encode: CMP = stddev
-fate-aac-ltp-encode: REF = $(SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav
-fate-aac-ltp-encode: CMP_SHIFT = -4096
-fate-aac-ltp-encode: CMP_TARGET = 1207
-fate-aac-ltp-encode: SIZE_TOLERANCE = 3560
-fate-aac-ltp-encode: FUZZ = 17
-
 #Ticket1784
 FATE_AAC_ENCODE += fate-aac-yoraw-encode
 fate-aac-yoraw-encode: CMD = enc_dec_pcm adts wav s16le $(TARGET_SAMPLES)/audio-reference/yo.raw-short.wav -c:a aac -fflags +bitexact -flags +bitexact