pixman: add libs property (#34281)

var/spack/repos/builtin/packages/pixman/package.py

@@ -52,6 +52,10 @@ def patch_config_h_for_intel(self):
                 config_h,
             )
 
+    @property
+    def libs(self):
+        return find_libraries("libpixman-1", self.prefix, shared=True, recursive=True)
+
     def configure_args(self):
         args = [
             "--enable-libpng",