Make the type of N_THREADS to be INTEGER*4 explicitly

When building with -fdefault-integer=8, the type changes, but
only some compiler like gfortran implements `omp_set_num_threads`
with integer*8 input. When swapping the openmp library with
LLVM openmp, this doesn't work yet. Until LLVM openmp is fixed
explicitly setting the type fixes the build issue.

Author: isuruf

TESTING/EIG/cchkee.F

@@ -1072,7 +1072,8 @@ PROGRAM CCHKEE
       CHARACTER*80       LINE
       INTEGER            I, I1, IC, INFO, ITMP, K, LENP, MAXTYP, NEWSD,
      $                   NK, NN, NPARMS, NRHS, NTYPES,
-     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH, N_THREADS
+     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH
+      INTEGER*4          N_THREADS
       REAL               EPS, S1, S2, THRESH, THRSHN
 *     ..
 *     .. Local Arrays ..

TESTING/EIG/dchkee.F

@@ -1078,7 +1078,8 @@ PROGRAM DCHKEE
       CHARACTER*80       LINE
       INTEGER            I, I1, IC, INFO, ITMP, K, LENP, MAXTYP, NEWSD,
      $                   NK, NN, NPARMS, NRHS, NTYPES,
-     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH, N_THREADS
+     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH
+      INTEGER*4          N_THREADS
       DOUBLE PRECISION   EPS, S1, S2, THRESH, THRSHN
 *     ..
 *     .. Local Arrays ..

TESTING/EIG/schkee.F

@@ -1078,7 +1078,8 @@ PROGRAM SCHKEE
       CHARACTER*80       LINE
       INTEGER            I, I1, IC, INFO, ITMP, K, LENP, MAXTYP, NEWSD,
      $                   NK, NN, NPARMS, NRHS, NTYPES,
-     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH, N_THREADS
+     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH
+      INTEGER*4          N_THREADS
       REAL               EPS, S1, S2, THRESH, THRSHN
 *     ..
 *     .. Local Arrays ..

TESTING/EIG/zchkee.F

@@ -1072,7 +1072,8 @@ PROGRAM ZCHKEE
       CHARACTER*80       LINE
       INTEGER            I, I1, IC, INFO, ITMP, K, LENP, MAXTYP, NEWSD,
      $                   NK, NN, NPARMS, NRHS, NTYPES,
-     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH, N_THREADS
+     $                   VERS_MAJOR, VERS_MINOR, VERS_PATCH
+      INTEGER*4          N_THREADS
       DOUBLE PRECISION   EPS, S1, S2, THRESH, THRSHN
 *     ..
 *     .. Local Arrays ..