fix csvparser for xmake 2.9.4 (#4992)

it's a header only library

packages/c/csvparser/xmake.lua

@@ -1,5 +1,5 @@
 package("csvparser")
-
+    set_kind("library", { headeronly = true })
     set_homepage("https://github.com/vincentlaucsb/csv-parser")
     set_description("A modern C++ library for reading, writing, and analyzing CSV (and similar) files (by vincentlaucsb)")
 
@@ -26,4 +26,4 @@ package("csvparser")
                 }
             }
         ]]}, {includes = "csv.hpp", configs = {languages = "cxx17"}}))
-    end)
+    end)