qa.py: Modify the env for the child process only

Modified environment is only required for new subprocess to execute
objdump command and not for the current process. We should only
modify the copy of env to pass it on to the child.

(From OE-Core rev: cb3b046450b47739daf441a0b964823aff2472e6)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Muhammad Shakeel <muhammad_shakeel@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/qa.py

@@ -99,7 +99,7 @@ class ELFFile:
         objdump = d.getVar('OBJDUMP', True)
         staging_dir = d.getVar('STAGING_BINDIR_TOOLCHAIN', True)
 
-        env = os.environ
+        env = os.environ.copy()
         env["LC_ALL"] = "C"
 
         try: