Remove ci_boost_library_check from Travis

.travis.yml

@@ -69,11 +69,11 @@ matrix:
     - env: SCRIPT=ci_boost_test_library TOOLSET=clang CXXSTD=11
       compiler: clang++
 
-    # Library requirements tests.
-    - env: SCRIPT=ci_boost_library_check
-
-  allow_failures:
-    - env: SCRIPT=ci_boost_library_check
+#    # Library requirements tests.
+#    - env: SCRIPT=ci_boost_library_check
+#
+#  allow_failures:
+#    - env: SCRIPT=ci_boost_library_check
 
 before_install:
   # Fetch the scripts to do the actual building/testing.