add version info about leptonica and available image libs

Author: zdenop

src/jbig2.cc

@@ -250,6 +250,15 @@ main(int argc, char **argv) {
     if (strcmp(argv[i], "-V") == 0 ||
         strcmp(argv[i], "--version") == 0) {
       fprintf(stderr, "jbig2enc %s\n", getVersion());
+
+      char *versionStrP;
+      versionStrP = getLeptonicaVersion();
+      printf(" %s\n", versionStrP);
+      lept_free(versionStrP);
+
+      versionStrP = getImagelibVersions();
+      printf("  %s\n", versionStrP);
+      lept_free(versionStrP);
       return 0;
     }