Do not hardcode Dynlink error in test output

Fixes #1047

tests/cram.t/run.t

@@ -1,6 +1,6 @@
-  $ echo '(check-sat)' | alt-ergo --inequalities-plugin does-not-exist -i smtlib2 -o smtlib2 2>&1 >/dev/null | sed -E 's/\(\\".*\\"\)//'
+  $ echo '(check-sat)' | alt-ergo --inequalities-plugin does-not-exist -i smtlib2 -o smtlib2 2>&1 >/dev/null | sed -E 's/(error loading shared library):.*/\1/'
   alt-ergo: ; Fatal Error: [Dynlink] Loading the 'inequalities' reasoner (FM module) plugin in "does-not-exist" failed!
-            >> Failure message: error loading shared library: Dynlink.Error (Dynlink.Cannot_open_dll "Failure")
+            >> Failure message: error loading shared library
 
 Now we will have some tests for the models. Note that it is okay if the format
 changes slightly, you should be concerned with ensuring the semantic is