fix build of scite on i386

ld: error: /usr/local/lib/libscintilla.so.12.0: undefined reference to Scintilla::Internal::RunStyles<long, int>::DeleteAll() [--no-allow-shlib-undefined]
ld: error: /usr/local/lib/libscintilla.so.12.0: undefined reference to Scintilla::Internal::RunStyles<long, int>::InsertSpace(long, long) [--no-allow-shlib-undefined] 

cf https://groups.google.com/g/scintilla-interest/c/xPXquJUIXo8/m/BLXBpTTgBwAJ
& https://sourceforge.net/p/scintilla/bugs/2315/

Index: src/RunStyles.cxx
--- src/RunStyles.cxx.orig
+++ src/RunStyles.cxx
@@ -307,7 +307,7 @@ void RunStyles<DISTANCE, STYLE>::Check() const {
 
 template class Scintilla::Internal::RunStyles<int, int>;
 template class Scintilla::Internal::RunStyles<int, char>;
-#if (PTRDIFF_MAX != INT_MAX) || defined(__HAIKU__)
+#if (PTRDIFF_MAX != INT_MAX) || defined(__HAIKU__) || defined(__OpenBSD__)
 template class Scintilla::Internal::RunStyles<ptrdiff_t, int>;
 template class Scintilla::Internal::RunStyles<ptrdiff_t, char>;
 #endif