Bitbake ungracefully crashes when chrpath is not installed.

A warning or error should be displayed when trying to build without it.


----------------------------------------------------------------
ERROR: Error executing a python function in /media/sdb5/eel/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb:
 
The stack trace of python calls that resulted in this exception/failure was:
File: 'relocatable_binaries_preprocess', lineno: 6, function: <module>
     0002:def relocatable_binaries_preprocess(d):
     0003:    rpath_replace(d.expand('/media/sdb5/eel/build/tmp/work/x86_64-linux/quilt-native/0.60-r0/sysroot-destdir/'), d)
     0004:
     0005:
 *** 0006:relocatable_binaries_preprocess(d)
     0007:
File: 'relocatable_binaries_preprocess', lineno: 3, function: relocatable_binaries_preprocess
     0001:
     0002:def relocatable_binaries_preprocess(d):
 *** 0003:    rpath_replace(d.expand('/media/sdb5/eel/build/tmp/work/x86_64-linux/quilt-native/0.60-r0/sysroot-destdir/'), d)
     0004:
     0005:
     0006:relocatable_binaries_preprocess(d)
     0007:
File: 'chrpath.bbclass', lineno: 7, function: rpath_replace
     0003:
     0004:    for bindir in bindirs:
     0005:        #bb.note ("Processing directory " + bindir)
     0006:        directory = path + "/" + bindir
 *** 0007:        process_dir (path, directory, d)
     0008:
File: 'chrpath.bbclass', lineno: 43, function: process_dir
     0039:                perms = None
     0040:            else:
     0041:                # Temporarily make the file writeable so we can chrpath it
     0042:                os.chmod(fpath, perms|stat.S_IRWXU)
 *** 0043:            process_file(cmd, fpath, rootdir, baseprefix, tmpdir, d)
     0044:
     0045:            if perms:
     0046:                os.chmod(fpath, perms)
     0047:
File: 'chrpath.bbclass', lineno: 4, function: process_file_linux
  File "chrpath.bbclass", line 4, in process_file_linux
 
File: '/usr/lib/python2.7/subprocess.py', lineno: 709, function: __init__
     0705:                                cwd, env, universal_newlines,
     0706:                                startupinfo, creationflags, shell, to_close,
     0707:                                p2cread, p2cwrite,
     0708:                                c2pread, c2pwrite,
 *** 0709:                                errread, errwrite)
     0710:        except Exception:
     0711:            # Preserve original exception in case os.close raises.
     0712:            exc_type, exc_value, exc_trace = sys.exc_info()
     0713:
File: '/usr/lib/python2.7/subprocess.py', lineno: 1326, function: _execute_child
     1322:                except OSError as e:
     1323:                    if e.errno != errno.ECHILD:
     1324:                        raise
     1325:                child_exception = pickle.loads(data)
 *** 1326:                raise child_exception
     1327:
     1328:
     1329:        def _handle_exitstatus(self, sts, _WIFSIGNALED=os.WIFSIGNALED,
     1330:                _WTERMSIG=os.WTERMSIG, _WIFEXITED=os.WIFEXITED,
Exception: OSError: [Errno 2] No such file or directory
 
ERROR: Function failed: relocatable_binaries_preprocess
ERROR: Logfile of failure stored in: /media/sdb5/eel/build/tmp/work/x86_64-linux/quilt-native/0.60-r0/temp/log.do_populate_sysroot.4713
ERROR: Task 17 (/media/sdb5/eel/poky/meta/recipes-devtools/quilt/quilt-native_0.60.bb, do_populate_sysroot) failed with exit code '1'