Fix using aggregate functions with Swift 5.

In Swift 5, the value of `#function` for e.g. `func count(_:)` has changed from `count` to `count(_:)` (see swiftlang/swift#19062), causing `wrap` to produce invalid SQL. We fix this by only using the part of `#function` preceding the first opening parenthesis.

Author: MrMage

Sources/SQLite/Helpers.swift

@@ -99,15 +99,15 @@ extension String {
 }
 
 func infix<T>(_ lhs: Expressible, _ rhs: Expressible, wrap: Bool = true, function: String = #function) -> Expression<T> {
-    return function.infix(lhs, rhs, wrap: wrap)
+    return function.components(separatedBy: "(")[0].infix(lhs, rhs, wrap: wrap)
 }
 
 func wrap<T>(_ expression: Expressible, function: String = #function) -> Expression<T> {
-    return function.wrap(expression)
+    return function.components(separatedBy: "(")[0].wrap(expression)
 }
 
 func wrap<T>(_ expressions: [Expressible], function: String = #function) -> Expression<T> {
-    return function.wrap(", ".join(expressions))
+    return function.components(separatedBy: "(")[0].wrap(", ".join(expressions))
 }
 
 func transcode(_ literal: Binding?) -> String {