code cleanup: remove unused phonemetable ak (akan)

phsource/ph_akan

-
-phoneme i
-  vwl starttype #i endtype #i
-  length 170
-  FMT(vowel/i)
-endphoneme
-
-phoneme e
-  vwl starttype #e endtype #e
-  length 170
-  FMT(vowel/e_6)
-endphoneme
-
-phoneme E
-  vwl starttype #e endtype #e
-  length 170
-  FMT(vowel/ee_5)
-endphoneme
-
-
-phoneme a
-  vwl starttype #a endtype #a
-  length 170
-  FMT(vowel/aa_9)
-endphoneme
-
-
-phoneme O
-  vwl starttype #o endtype #o
-  length 170
-  FMT(vowel/oo_2)
-endphoneme
-
-
-phoneme o
-  vwl starttype #o endtype #o
-  length 170
-  FMT(vowel/o)
-endphoneme
-
-
-phoneme u
-  vwl starttype #u endtype #u
-  length 170
-  FMT(vowel/u)
-endphoneme
-

phsource/phonemes

 phonemetable base2 base1
 include ph_base2
 
-phonemetable ak base1
-include ph_akan
-
 phonemetable am base1
 include ph_amhari