Make the glibc check more generic, since it caused the build to fail.

Author: kannanjgithub

testing/src/main/java/io/grpc/internal/testing/TestUtils.java

@@ -170,9 +170,9 @@ public static void installConscryptIfAvailable() {
       provider = ConscryptLoader.newProvider();
     } catch (Throwable t) {
       Throwable root = Throwables.getRootCause(t);
-      // Conscrypt uses a newer version of glibc than available on RHEL 6
+      // Conscrypt uses a newer version of glibc than available on older Linux distributions (e.g. RHEL 6/8)
       if (root instanceof UnsatisfiedLinkError && root.getMessage() != null
-          && root.getMessage().contains("GLIBC_2.14")) {
+          && root.getMessage().contains("GLIBC_")) {
         conscryptInstallAttempted = true;
         return;
       }