Issue #9437: Fix building C extensions with non-default LDFLAGS.

sysconfig.py

@@ -359,6 +359,11 @@ def parse_makefile(fn, g=None):
 
     fp.close()
 
+    # strip spurious spaces
+    for k, v in done.items():
+        if isinstance(v, str):
+            done[k] = v.strip()
+
     # save the results in the global dictionary
     g.update(done)
     return g