Fix overly generic exceptions in log parser (#27413)

This type of error is skipped:

make[1]: *** [Makefile:222: /tmp/user/spack-stage/.../spack-src/usr/lib/julia/libopenblas64_.so.so] Error 1

but it's useful to have it, especially when a package sets a variable
incorrectly in makefiles

lib/spack/external/ctest_log_parser.py

@@ -150,8 +150,6 @@
     ": note",
     "    ok",
     "Note:",
-    "makefile:",
-    "Makefile:",
     ":[ \\t]+Where:",
     "[^ :]:[0-9]+: Warning",
     "------ Build started: .* ------",
@@ -189,8 +187,6 @@
     "/usr/.*/X11/XResource\\.h:[0-9]+: war.*: ANSI C\\+\\+ forbids declaration",
     "WARNING 84 :",
     "WARNING 47 :",
-    "makefile:",
-    "Makefile:",
     "warning:  Clock skew detected.  Your build may be incomplete.",
     "/usr/openwin/include/GL/[^:]+:",
     "bind_at_load",