Fix clang 17 build: add <fstream> include to RcppExports.cpp

XPtr<std::ifstream> requires the full definition of std::ifstream to
instantiate its destructor. clang 17 (macOS) no longer provides it
transitively through Rcpp.h, causing compilation failure.

Note: if compileAttributes() is re-run, this include must be re-added.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jimb3

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: BinaryDosage
 Title: Creates, Merges, and Reads Binary Dosage Files
-Version: 1.0.0.9016
+Version: 1.0.0.9017
 Authors@R:
     c(person(given = "John",
              family = "Morrison",

src/RcppExports.cpp

@@ -1,6 +1,7 @@
 // Generated by using Rcpp::compileAttributes() -> do not edit by hand
 // Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393
 
+#include <fstream>  // required for XPtr<std::ifstream> on clang 17+
 #include <Rcpp.h>
 
 using namespace Rcpp;