[fixinc] c_asm.h fix and incomplete use of fixinc.tmp in fixincl.sh

[Alexandre Oliva]

Hi!

The sed commands in the recently installed fix for c_asm.h are
incorrect.  Furthermore, the shell-script uses ${DESTNAME}. and
FIXINC.tmp for temporaries, instead of the new fixinc.tmp.  This patch 
is supposed to fix these two problems.  Ok to install?

-- 
Alexandre Oliva http://www.dcc.unicamp.br/~oliva IC-Unicamp, Brasil
{oliva,Alexandre.Oliva}@dcc.unicamp.br  aoliva@{acm.org,computer.org}
oliva@{gnu.org,kaffe.org,{egcs,sourceware}.cygnus.com,samba.org}
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