tests: Don't expect any *.pdb files installed in 'lib'

Static libraries don't have PDB files. A PDB that would previously end
up installed alongside a static library belonged in fact to the dynamic
version of the same library built at the same time.

This was because the former minstall.Installer implementation, when
installing a file target, also blindly copied any *.pdb file it found
whose filename was matching the target. So, for example installing
foo.dll and foo.a would also install two copies of foo.pdb into both
bin/ and lib/, which doesn't seem like the right thing to do - foo.pdb
should only get installed with foo.dll.

test cases/common/206 install name_prefix name_suffix/installed_files.txt

@@ -1,9 +1,6 @@
 ?msvc:usr/bin/baz.pdb
 ?msvc:usr/bin/bowcorge.pdb
 ?msvc:usr/bin/foo.pdb
-?msvc:usr/lib/baz.pdb
-?msvc:usr/lib/bowcorge.pdb
-?msvc:usr/lib/foo.pdb
 usr/?lib/bowcorge.stern
 usr/lib/?libbaz.cheese
 usr/lib/bar.a

test cases/d/5 mixed/installed_files.txt

@@ -5,4 +5,3 @@ usr/lib/libstuff.a
 ?msvc:usr/bin/stuff.dll
 ?msvc:usr/bin/stuff.pdb
 ?msvc:usr/lib/stuff.lib
-?msvc:usr/lib/stuff.pdb

test cases/windows/7 dll versioning/installed_files.txt

@@ -4,7 +4,6 @@
 ?msvc:usr/bin/noversion.dll
 ?msvc:usr/bin/noversion.pdb
 ?msvc:usr/lib/noversion.lib
-?msvc:usr/lib/noversion.pdb
 ?msvc:usr/bin/onlyversion-1.dll
 ?msvc:usr/bin/onlyversion-1.pdb
 ?msvc:usr/lib/onlyversion.lib