remove dead code that is immediately overridden

In commit d932cd9fb4, we migrated to
meson's own static linker definition, and the old code that hardcoded
two of the possible exelists should have been removed in the process.

unittests/allplatformstests.py

@@ -1441,10 +1441,6 @@ class AllPlatformTests(BasePlatformTests):
     def build_static_lib(self, compiler, linker, source, objectfile, outfile, extra_args=None):
         if extra_args is None:
             extra_args = []
-        if compiler.get_argument_syntax() == 'msvc':
-            link_cmd = ['lib', '/NOLOGO', '/OUT:' + outfile, objectfile]
-        else:
-            link_cmd = ['ar', 'csr', outfile, objectfile]
         link_cmd = linker.get_exelist()
         link_cmd += linker.get_always_args()
         link_cmd += linker.get_std_link_args(False)