Fix -Wformat-security issues, as we do not want to install potentially
dangerous example C++ files on user systems:
* ex18.C: In function ‘int main(int, char**)’:
* ex18.C:92:27: warning: format not a string literal and no format arguments [-Wformat-security]
*   sprintf(filename, argv[i]);

--- a/examples/ex18.C
+++ b/examples/ex18.C
@@ -89,7 +89,7 @@
         exit(1);
       }
       else{
-	sprintf(filename, argv[i]);
+	sprintf(filename, "%s", argv[i]);
         continue;
       }
     }
--- a/examples/ex3.C
+++ b/examples/ex3.C
@@ -71,7 +71,7 @@
         exit(1);
       }
       else{
-	sprintf(filename, argv[i]);
+	sprintf(filename, "%s", argv[i]);
         continue;
       }
     }
--- a/examples/ex5.C
+++ b/examples/ex5.C
@@ -308,7 +308,7 @@
         exit(1);
       }
       else{
-        sprintf(filename1, argv[i]);
+        sprintf(filename1, "%s", argv[i]);
         continue;
       }
     }
@@ -318,7 +318,7 @@
         exit(1);
       }
       else{
-        sprintf(filename2, argv[i]);
+        sprintf(filename2, "%s", argv[i]);
         continue;
       }
     }
--- a/examples/ex7.C
+++ b/examples/ex7.C
@@ -68,7 +68,7 @@
         exit(1);
       }
       else{
-	sprintf(datafile, argv[i]);
+	sprintf(datafile, "%s", argv[i]);
         continue;
       }
     }
@@ -78,7 +78,7 @@
         exit(1);
       }
       else{
-	sprintf(parmfile, argv[i]);
+	sprintf(parmfile, "%s", argv[i]);
 	params.read(parmfile);
         continue;
       }
--- a/ga/gaerror.C
+++ b/ga/gaerror.C
@@ -21,7 +21,7 @@
 static STD_OSTREAM *__gaErrStream = & STD_CERR;
 #endif
 static GABoolean __gaErrFlag = gaTrue;
-static char *__gaErrStr[] = {
+static const char *__gaErrStr[] = {
   "error reading from file: ",
   "error writing to file: ",
   "unexpected EOF encountered during read.",