windows-makefile.tmpl: delete export library prior link.
LINK can outsmart itself and choose to not update export .lib upon
corresponding .dll re-link. Since dependency is between .lib and all
.obj-s, re-compilation of any .obj makes NMAKE relink .dll and all
.exe-s over and over...
@@ -627,6 +627,7 @@ EOF
return <<"EOF"
$target: $deps
IF EXIST $shlib$shlibext.manifest DEL /F /Q $shlib$shlibext.manifest
+ IF EXIST \$@ DEL /F /Q \$@
\$(LD) \$(LDFLAGS) \$(LIB_LDFLAGS) \\
/implib:\$@ \$(LDOUTFLAG)$shlib$shlibext$shared_def @<< || (DEL /Q \$(\@B).* $shlib.* && EXIT 1)
$objs
