musl: Create default library search path based on configuration
In absence of /etc/ld-musl-$(ARCH).path file musl uses hardcoded default
search path "/lib:/usr/local/lib:/usr/lib". This works for cases when
system libraries installed in one of these pathes.
However if lib64 or libx32 used as system library directories and no
usr merge functionality enabled for distro musl dynamic loader cannot
find libraries and finally execute binaries.
Found while working on support for musl on powerpc64 builds where
lib64 variant is used regardless of multilib being on or off.
Fix by creating default search path based on configuration time values
for syslibdir and libdir.
Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
