insane.bbclass: Count raw bytes in shebang-size

Operating systems limit the shebang to a maximum number of bytes.
This patch makes the shebang-size check count raw bytes instead of UTF-8 characters.

(From OE-Core rev: d4ac66c5cdaf971fb717cc5c5bf9aa51a787d412)

Signed-off-by: Jan Garcia <j@n-garcia.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-global/insane.bbclass

@@ -97,9 +97,8 @@ def package_qa_check_shebang_size(path, name, d, elf, messages):
         return
 
     if stanza.startswith(b'#!'):
-        #Shebang not found
         try:
-            stanza = stanza.decode("utf-8")
+            stanza.decode("utf-8")
         except UnicodeDecodeError:
             #If it is not a text file, it is not a script
             return