kraaij_pohlmann.sbl: Remove conversion of y to Y

The Snowball implementation tries to identify cases where `y` is a
consonant and temporarily changes these to `Y` which is then treated as
a consonant during stemming (then `Y` is changed back to `y` before
returning).  However the original C Kraaij-Pohlmann implementation does
not do this (it's taken from the Porter stemmers for English, French,
German and Dutch).

A quick scan of the stemming differences resulting from this change
suggests that the this extra handling only helps by conflating `royale`
with `royaal` but possibly there are additional cases and this extra
tweak is useful.  However it's getting in the way of resolving the
differences between the C and Snowball implementations so remove at
least for now and review later.

This reduces the number of words which stem differently from 65 to 45.

See #1

algorithms/kraaij_pohlmann.sbl

@@ -1,6 +1,6 @@
 strings ( ch )
 integers ( p1 p2 )
-booleans ( Y_found stemmed GE_removed )
+booleans ( stemmed GE_removed )
 
 routines (
 
@@ -250,10 +250,7 @@ define measure as (
 )
 define stem as (
 
-    unset Y_found
     unset stemmed
-    do ( ['y'] <-'Y' set Y_found )
-    do repeat(goto (v  ['y'])<-'Y' set Y_found )
 
     measure
 
@@ -277,6 +274,5 @@ define stem as (
             do (Step_7 set stemmed )
             do (stemmed or GE_removed Step_6)
         )
-    do(Y_found  repeat(goto (['Y']) <-'y'))
 )