Log Message:
Fix the part of the makefile that builds "preloadable_libiconv.so" under
Solaris if GCC is used. As this bit is both operating system and compiler
specific we can simple bypass "libtool" which is what must have happened
with the old "libtool".

The build in the non-GCC case or under Linux respectively OSF1 might
still be broken. But I don't have a setup to test that.