Cleanup fseeko references.

It appears basically unused and over-configured, except maybe in make_vms.com.
Even so, NO_FSEEKO is not used.

CMakeLists.txt

@@ -47,12 +47,9 @@ endif()
 set(CMAKE_REQUIRED_DEFINITIONS) # clear variable
 
 #
-# Check for fseeko
+# Check for fseeko. This only maybe affects VMS, see make_vms.com.
 #
 check_function_exists(fseeko HAVE_FSEEKO)
-if(NOT HAVE_FSEEKO)
-    add_definitions(-DNO_FSEEKO)
-endif()
 
 #
 # Check for unistd.h

configure

@@ -504,7 +504,7 @@ fi
 
 echo >> configure.log
 
-# check for large file support, and if none, check for fseeko()
+# check for large file support
 cat > $test.c <<EOF
 #include <sys/types.h>
 off64_t dummy = 0;
@@ -516,23 +516,6 @@ if try $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c; then
   TEST="${TEST} test64"
   echo "Checking for off64_t... Yes." | tee -a configure.log
   echo "Checking for fseeko... Yes." | tee -a configure.log
-else
-  echo "Checking for off64_t... No." | tee -a configure.log
-  echo >> configure.log
-  cat > $test.c <<EOF
-#include <stdio.h>
-int main(void) {
-  fseeko(NULL, 0, 0);
-  return 0;
-}
-EOF
-  if try $CC $CFLAGS -o $test $test.c; then
-    echo "Checking for fseeko... Yes." | tee -a configure.log
-  else
-    CFLAGS="${CFLAGS} -DNO_FSEEKO"
-    SFLAGS="${SFLAGS} -DNO_FSEEKO"
-    echo "Checking for fseeko... No." | tee -a configure.log
-  fi
 fi
 
 echo >> configure.log