Fix abi.encodeCall checks

test/libsolidity/syntaxTests/abiEncoder/abi_encodeCall_error_free_function.sol

@@ -0,0 +1,7 @@
+error E(uint);
+
+function f() {
+    abi.encodeCall(E, (1));
+}
+// ----
+// TypeError 3509: (50-51): Expected regular external function type, or external view on public function. Cannot use errors for abi.encodeCall.

test/libsolidity/syntaxTests/abiEncoder/abi_encodeCall_event_free_function.sol

@@ -0,0 +1,9 @@
+library L {
+    event E(uint);
+}
+
+function f() {
+    abi.encodeCall(L.E, (1));
+}
+// ----
+// TypeError 3509: (68-71): Expected regular external function type, or external view on public function. Cannot use events for abi.encodeCall.

test/libsolidity/syntaxTests/abiEncoder/abi_encodeCall_free_func.sol

@@ -0,0 +1,7 @@
+function g(uint) {}
+
+function f() {
+    abi.encodeCall(g, (1));
+}
+// ----
+// TypeError 3509: (55-56): Expected regular external function type, or external view on public function. Provided internal function.

test/libsolidity/syntaxTests/abiEncoder/abi_encodeCall_on_lib_func_in_free_func.sol

@@ -0,0 +1,9 @@
+library L {
+    function g() external {}
+}
+
+function f() {
+    abi.encodeCall(L.g, (1));
+}
+// ----
+// TypeError 3509: (78-81): Expected regular external function type, or external view on public function. Cannot use library functions for abi.encodeCall.