Update minimum gcc version in 'bldlvlck'

Update minimum gcc version from 4.6.2 to 6.2.0.
If $CC environment variable is set, use that instead of 'gcc'.

Author: wrljet

util/bldlvlck

@@ -7,7 +7,7 @@
 #  This perl script checks the user's system for the required levels of
 #  software needed to properly build Hercules from the source repository.
 #
-#  Updated 3 DEC 2021
+#  Updated 11 DEC 2021
 #
 #****************************************************************************
 
@@ -34,7 +34,7 @@ my @req = qw(
      cmake       3.2    0  https://cmake.org
      flex        2.5    0  http://www.gnu.org/directory/flex.html
      gawk        3.0    0  http://www.gnu.org/directory/gawk.html
-     gcc         4.6.2  1  http://www.gnu.org/directory/gcc.html
+     gcc         6.2.0  1  http://www.gnu.org/directory/gcc.html
      grep        1      0  http://www.gnu.org/directory/grep.html
      ld          2.22   0  http://www.gnu.org/directory/binutils.html
      libtool     2.4.6  1  https://sdl-hercules-390.github.io/html/hercinst.html
@@ -245,8 +245,11 @@ sub weird {
     return;
   }
 
+
   if ($facility eq 'gcc') {
-    if (present($facility, $url)) {
+    my $cc = $ENV{"CC"} || "gcc";
+
+    if (present($cc, $url)) {
       my @resp;
       if ($^O eq 'netbsd') {
         @resp = `$facility -dumpversion`;
@@ -263,7 +266,7 @@ sub weird {
           print "$msg\t$facility (32-bit) requires $gcc_i686_required, found $instversion\n";
       } else {
           $msg = ckvers($level, $instversion);
-          print "$msg\t$facility requires $level, found $instversion\n";
+          print "$msg\t$facility requires $level, found $cc $instversion\n";
       }
       print "\tURL: $url\n" if $msg eq 'UPGRADE';
     }
@@ -282,7 +285,7 @@ sub weird {
         print "\t$resp[0]\n";
         if ($resp[0] =~ /sed: unknown option/) {
           # print "netbsd: \n";
-	}
+        }
 
         print "$msg\t$facility requires $level, found $instversion\n";
         print "\tURL: $url\n" if $msg eq 'UPGRADE';
@@ -297,7 +300,7 @@ sub weird {
         print "\t$resp[0]\n";
         if ($resp[0] =~ /sed: unknown option/) {
           # print "netbsd: \n";
-	}
+        }
 
         print "$msg\t$facility requires $level, found $instversion\n";
         print "\tURL: $url\n" if $msg eq 'UPGRADE';