Exclude gnu.org from the URL checker tests

Author: jsiirola

.coin-or/projDesc.xml

@@ -157,7 +157,6 @@ Carl D. Laird, Chair, Pyomo Management Committee, claird at andrew dot cmu dot e
 		<!--         GLPK                                              -->
 		<!--      </packageName>                                       -->
 		<!--      <packageURL>                                         -->
-		<!--         http://www.gnu.org/software/glpk/                 -->
 		<!--      </packageURL>                                        -->
 		<!--      <requiredOrOptional>                                 -->
 		<!--         Optional                                          -->

.github/workflows/test_branches.yml

@@ -64,9 +64,13 @@ jobs:
         verbose: true
         # How many times to retry a failed request (defaults to 1)
         retry_count: 3
-        # Exclude Jenkins because it's behind a firewall; ignore RTD because
-        # a magically-generated string is triggering a failure
+        # Exclude:
+        #  - Jenkins because it's behind a firewall
+        #  - RTD because a magically-generated string triggers failures
         exclude_urls: https://pyomo-jenkins.sandia.gov/,https://pyomo.readthedocs.io/en/%s/errors.html
+        # Exclude:
+        #  - All gnu.org links because they consistently fail the checker
+        exclude_patterns: https://www.gnu.org
 
 
   build:

.github/workflows/test_pr_and_main.yml

@@ -75,9 +75,13 @@ jobs:
         verbose: true
         # How many times to retry a failed request (defaults to 1)
         retry_count: 3
-        # Exclude Jenkins because it's behind a firewall; ignore RTD because
-        # a magically-generated string is triggering a failure
+        # Exclude:
+        #  - Jenkins because it's behind a firewall
+        #  - RTD because a magically-generated string triggers failures
         exclude_urls: https://pyomo-jenkins.sandia.gov/,https://pyomo.readthedocs.io/en/%s/errors.html
+        # Exclude:
+        #  - All gnu.org links because they consistently fail the checker
+        exclude_patterns: https://www.gnu.org
 
 
   build:

.github/workflows/url_check.yml

@@ -30,3 +30,6 @@ jobs:
         #  - Jenkins because it's behind a firewall
         #  - RTD because a magically-generated string triggers failures
         exclude_urls: https://pyomo-jenkins.sandia.gov/,https://pyomo.readthedocs.io/en/%s/errors.html
+        # Exclude:
+        #  - All gnu.org links because they consistently fail the checker
+        exclude_patterns: https://www.gnu.org