Velarize [n] to [ŋ] before velar stops in Elvish

I’m not aware of any statement by Tolkien to this effect, but it just
seems natural to me, and the [ŋ] is at least found in the Omikhleia
Sindarin dictionary [1] (e.g. entry tinc, [tˈiŋk]).

Based on a similar phoneme rule in ph_english.

[1]: https://www.jrrvf.com/hisweloke/sindar/index.html

phsource/ph_quenya

@@ -1,3 +1,11 @@
+phoneme n
+  IF nextPhW(isVelar) THEN // /n/ is velarized to /N/ when before velar stops
+    ChangePhoneme(N)
+  ENDIF
+  CALL base1/n
+endphoneme
+
+
 phoneme ui
   vwl starttype #u endtype #i
   length 270

phsource/ph_sindarin

@@ -1,3 +1,11 @@
+phoneme n
+  IF nextPhW(isVelar) THEN // /n/ is velarized to /N/ when before velar stops
+    ChangePhoneme(N)
+  ENDIF
+  CALL base1/n
+endphoneme
+
+
 phoneme aE
   vwl starttype #a endtype #e
   length 270

tests/language-pronunciation.test

@@ -186,7 +186,7 @@ S'a
 'OksidU
 p'or-
 z'&~Ng&U~_:_: ,E*&U~ p,&l'avR&Z dU p,u*@-tug'es#" "Luís argüia à Júlia que «brações, fé, chá, óxido, pôr, zângão» eram palavras do português." "Latn"
-test_phon qya ",aInul'indal,e ald'iNga ank'alim,a and'u:Ril at'akwe k,alak'iRja k,uivi;'e:nen ,eaR'endil el'endil ,elent'a:Ri; el'essaR 'enkwi;,e e'onwe eR'esse,a h,elkaR'akse hj'aRmen is'ilduR nam'a:Ri;,e n,u:men'o:Re 'oRom,e ot'okwe pel'o:Ri s'aURon tan'ikwet,il tuR'ambaR und'o:mi;,el ut'umno" "Ainulindalë aldinga ancalima Andúril ataquë Calacirya Cuiviénen Eärendil Elendil Elentári Elessar enquië Eönwe Eressëa Helcaraxë Hyarmen Isildur Namárië Númenórë Orome otoquë Pelóri Sauron Taniquetil Turambar Undómiel Utumno" "Quenya"
+test_phon qya ",aInul'indal,e ald'iNga aNk'alim,a and'u:Ril at'akwe k,alak'iRja k,uivi;'e:nen ,eaR'endil el'endil ,elent'a:Ri; el'essaR 'eNkwi;,e e'onwe eR'esse,a h,elkaR'akse hj'aRmen is'ilduR nam'a:Ri;,e n,u:men'o:Re 'oRom,e ot'okwe pel'o:Ri s'aURon tan'ikwet,il tuR'ambaR und'o:mi;,el ut'umno" "Ainulindalë aldinga ancalima Andúril ataquë Calacirya Cuiviénen Eärendil Elendil Elentári Elessar enquië Eönwe Eressëa Helcaraxë Hyarmen Isildur Namárië Númenórë Orome otoquë Pelóri Sauron Taniquetil Turambar Undómiel Utumno" "Quenya"
 test_phon ro "m,uzikol'og@_! yn b'eZ v'ynd wh'iski Si tekw'ila
 p@-*'ets f'iks" "Muzicologă în bej vând whisky și tequila, preț fix." "Latn"
 test_phon ru "Syr'okVja E#l;ikt@-r;if;ik'Atsyja 'juZnyx gub;'ern;ij d'Ast m'oS;nyj tVltS;'ok pVdj'8mu s;'elskVvV xVz;'Ajstva#" "Широкая электрификация южных губерний даст мощный толчок подъёму сельского хозяйства." "Cyrl"