FPRow: Remove three unused methods

This fixes warnings from the Intel compiler:

    src/textord/cjkpitch.cpp(319): warning #177:
      function "<unnamed>::FPRow::good_gaps" was declared but never referenced
    src/textord/cjkpitch.cpp(383): warning #177:
      function "<unnamed>::FPRow::is_bad" was declared but never referenced
    src/textord/cjkpitch.cpp(387): warning #177:
      function "<unnamed>::FPRow::is_unknown" was declared but never referenced

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/textord/cjkpitch.cpp

@@ -309,10 +309,6 @@ class FPRow {
     return good_pitches_.size();
   }
 
-  int good_gaps() {
-    return good_gaps_.size();
-  }
-
   float pitch() {
     return pitch_;
   }
@@ -373,14 +369,6 @@ class FPRow {
     return characters_[i].alignment() == FPChar::ALIGN_GOOD;
   }
 
-  bool is_bad(int i) {
-    return characters_[i].alignment() == FPChar::ALIGN_BAD;
-  }
-
-  bool is_unknown(int i) {
-    return characters_[i].alignment() == FPChar::ALIGN_UNKNOWN;
-  }
-
   void mark_good(int i) {
     characters_[i].set_alignment(FPChar::ALIGN_GOOD);
   }