Update Path.swift

Author: compnerd

Sources/TSCBasic/Path.swift

@@ -258,8 +258,10 @@ public struct RelativePath: Hashable {
             self.init(PathImpl(string: string))
         } else {
 #if _runtime(_ObjC)
-            let normalized: [Int8] = string.fileSystemRepresentation
-            self.init(PathImpl(string: String(cString: normalized)))
+            self.init(PathImpl(string: withUnsafeTemporaryAllocation(of: Int8.self, capacity: Int(PATH_MAX) + 1) {
+              string.getFileSystemRepresentation($0.baseAddress, maxLength: $0.count)
+              return String(cString: $0.baseAddress!)
+            }))
 #else
             let normalized: UnsafePointer<Int8> = string.fileSystemRepresentation
             defer { normalized.deallocate() }