Fix build breaks in GC sample project

src/gc/gc.cpp

@@ -3894,9 +3894,6 @@ BOOL reserve_initial_memory (size_t normal_size, size_t large_size, size_t num_h
     g_lowest_address = MAX_PTR;
     g_highest_address = 0;
 
-    // Try to get the data all at once
-    ptrdiff_t allatonce_delta;
-
     if (((size_t)MAX_PTR - large_size) < normal_size)
     {
         // we are already overflowing with just one heap.

src/gc/sample/gcenv.cpp

@@ -205,6 +205,16 @@ void * ClrVirtualAlloc(
     return VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect);
 }
 
+void * ClrVirtualAllocAligned(
+    void * lpAddress,
+    size_t dwSize,
+    uint32_t flAllocationType,
+    uint32_t flProtect,
+    size_t dwAlignment)
+{
+    return VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect);
+}
+
 bool ClrVirtualFree(
     void * lpAddress,
     size_t dwSize,

src/gc/sample/gcenv.h

@@ -692,6 +692,13 @@ void * ClrVirtualAlloc(
     uint32_t flAllocationType,
     uint32_t flProtect);
 
+void * ClrVirtualAllocAligned(
+    void * lpAddress,
+    size_t dwSize,
+    uint32_t flAllocationType,
+    uint32_t flProtect,
+    size_t dwAlignment);
+
 bool ClrVirtualFree(
         void * lpAddress,
         size_t dwSize,