Description of problem:
A libtool .la file lists the .la files on which it depends using their exact
paths -- if the depended-on .la files is removed, the dependent .la file is
rendered useless.  This causes bugs like bug #159144 to just pop up from time to
time.

Version-Release number of selected component (if applicable):
4.4.1-21

How reproducible:
Always.

Steps to Reproduce:
1. Remove /usr/lib/libxml2.la from your system, or move it elsewhere.
2. Verify that /usr/lib/libxmlsec1-openssl.la lists /usr/lib/libxml2.la in its
   dependency_libs list.
3. Try to build a program using libtool:
   cat > foo.c << EOF
   int main(int argc, char **argv) { return 0; }
   EOF
   libtool --mode=compile --tag=CC cc -o foo.lo -c foo.c
   libtool --mode=link    --tag=CC cc -o foo foo.lo -lxmlsec1-openssl
  
Actual results:
libtool: link: cannot find the library `/usr/lib/libxml2.la'

Expected results:
(nothing)

Additional info:
Examples of how to do this are attachment #112735 [details] and attachment #112738 [details],
attached to bug #153935.