Wrong libtool files in `/opt/${target}/${target}/lib*`

[giordano]

Some of the libtool files in /opt/${target}/${target}/lib* contain wrong paths. For example, for x86_64-linux-gnu, /opt/x86_64-linux-gnu/x86_64-linux-gnu/lib64/libquadmath.la has the following libdir:

# Directory that this library needs to be installed in:
libdir='/workspace/destdir/x86_64-linux-gnu/lib/../lib64'

I assume this is the correct path when the file is generated and installed in ${prefix}, but then in the RootFS this is placed in /opt/${target} instead of /workspace/destdir.

Since these files often cause troubles during build, we should either remove or fix them

[staticfloat]

IMO we should just try always removing all .la files. I'd rather not rely on libtool files.

[fingolfin]

Since this BBB PR we are in fact removing all *.la files in any newly built JLL, but old existing JLLs will still have them.