use tab in Makefile
diff --git a/auto/cc/msvc b/auto/cc/msvc index 11c4682..01d6f7f 100644 --- a/auto/cc/msvc +++ b/auto/cc/msvc
@@ -125,7 +125,7 @@ ngx_binext=".exe" ngx_long_start='@<< - ' + ' ngx_long_end='<<' ngx_long_regex_cont=' \ '
