[0/3] Different sed program could be used in libtool script

[Yann Droneaud]

Hi,

Through out the libtool script, $SED is used, but sometimes 'sed' is
used directly.

Libtool should be consistent regarding to which sed is used in the
script.

Especially, ltmain.m4sh must used $SED, and libtool.m4 must use $SED in
macros like lt_cv_sys_global_symbol_pipe since there are copied in the
final libtool script.

The following patches try to correct that.

Regards

-- 
Yann Droneaud