fix a couple minor compiler warnings

src/ccstruct/normalis.cpp

@@ -410,7 +410,6 @@ void DENORM::DenormTransform(const DENORM* last_denorm, const FCOORD& pt,
 // Normalize a blob using blob transformations. Less accurate, but
 // more accurately copies the old way.
 void DENORM::LocalNormBlob(TBLOB* blob) const {
-  TBOX blob_box = blob->bounding_box();
   ICOORD translation(-IntCastRounded(x_origin_), -IntCastRounded(y_origin_));
   blob->Move(translation);
   if (y_scale_ != 1.0f)

src/ccutil/genericvector.h

@@ -983,7 +983,7 @@ template <typename T>
 bool GenericVector<T>::SkipDeSerialize(tesseract::TFile* fp) {
   uint32_t reserved;
   if (fp->FReadEndian(&reserved, sizeof(reserved), 1) != 1) return false;
-  return fp->FRead(nullptr, sizeof(T), reserved) == reserved;
+  return (uint32_t)fp->FRead(nullptr, sizeof(T), reserved) == reserved;
 }
 
 // Writes a vector of classes to the given file. Assumes the existence of

src/textord/colpartition.cpp

@@ -1153,7 +1153,6 @@ bool ColPartition::MarkAsLeaderIfMonospaced() {
       bool modified_blob_list = false;
       for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
         BLOBNBOX* blob = it.data();
-        TBOX box = blob->bounding_box();
         // If the first or last blob is spaced too much, don't mark it.
         if (it.at_first()) {
           int gap = it.data_relative(1)->bounding_box().left() -

src/wordrec/findseam.cpp

@@ -132,7 +132,7 @@ void Wordrec::choose_best_seam(SeamQueue *seam_queue, const SPLIT *split,
   TBOX bbox = blob->bounding_box();
   /* Queue loop */
   while (!seam_queue->empty()) {
-    SeamPair seam_pair;
+    SeamPair seam_pair();
     seam_queue->Pop(&seam_pair);
     seam = seam_pair.extract_data();
     /* Set full priority */