Correct the warning for homonymous, but not shadowing declarations

test/libsolidity/syntaxTests/scoping/name_pseudo_shadowing.sol

@@ -0,0 +1,6 @@
+contract test {
+    function e() external { }
+    function f() public pure { uint e; e = 0; }
+}
+// ----
+// Warning 8760: (77-83): This declaration has the same name as another declaration.

test/libsolidity/syntaxTests/scoping/name_shadowing2.sol

@@ -0,0 +1,6 @@
+function e() {}
+contract test {
+    function f() pure public { uint e; e = 0; }
+}
+// ----
+// Warning 2519: (63-69): This declaration shadows an existing declaration.