Spec Header Dirs: Only first include/ (#13991)

* CUDA HeaderList: Unit Test

* Spec Header Dirs: Only first include/

Avoid matching recurringly nested include paths that usually
refer to internally shipped libraries in packages.
Example in CUDA Toolkit, shipping a libc++ fork internally
with libcu++ since 10.2.89:
`<prefix>/include/cuda/some/more/details/include/` or
`<prefix>/include/cuda/std/detail/libcxx/include`

regex: non-greedy first match of include

Co-Authored-By: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* CUDA: Re-Enable 10.2.89 as Default

lib/spack/llnl/util/filesystem.py

@@ -1156,7 +1156,9 @@ class HeaderList(FileList):
 
     # Make sure to only match complete words, otherwise path components such
     # as "xinclude" will cause false matches.
-    include_regex = re.compile(r'(.*)(\binclude\b)(.*)')
+    # Avoid matching paths such as <prefix>/include/something/detail/include,
+    # e.g. in the CUDA Toolkit which ships internal libc++ headers.
+    include_regex = re.compile(r'(.*?)(\binclude\b)(.*)')
 
     def __init__(self, files):
         super(HeaderList, self).__init__(files)