Fix build failure of lld/ELF/OutputSections.cpp

On Windows when zlib is enabled, zlib header introduced some
Windows headers which defines max as a macro. Since OutputSections.cpp
uses std::max with template argument, this causes compilation
error.

Define NOMINMAX before include zlib header to avoid introducing
max as a macro.

Author: yxsamliu

lld/ELF/OutputSections.cpp

@@ -22,6 +22,8 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Support/TimeProfiler.h"
 #if LLVM_ENABLE_ZLIB
+// Avoid introducing max as a macro from Windows headers.
+#define NOMINMAX
 #include <zlib.h>
 #endif
 #if LLVM_ENABLE_ZSTD