insane: Fix buildpaths test to work with special devices

If enabled, the buildpaths test hangs in psplash as it tries to open
a fifo and read from it, hanging indefinitely.

Tweak the test to ignore fifo/socket/device files.

(From OE-Core rev: 2567edb7e0a8c5ca9a88d6940491bf33bfe0eff9)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/insane.bbclass

@@ -444,12 +444,14 @@ def package_qa_check_buildpaths(path, name, d, elf, messages):
     Check for build paths inside target files and error if paths are not
     explicitly ignored.
     """
+    import stat
     # Ignore .debug files, not interesting
     if path.find(".debug") != -1:
         return
 
-    # Ignore symlinks
-    if os.path.islink(path):
+    # Ignore symlinks/devs/fifos
+    mode = os.lstat(path).st_mode
+    if stat.S_ISLNK(mode) or stat.S_ISBLK(mode) or stat.S_ISFIFO(mode) or stat.S_ISCHR(mode) or stat.S_ISSOCK(mode):
         return
 
     tmpdir = bytes(d.getVar('TMPDIR'), encoding="utf-8")