chore: use c++17 to build core library

std::filesystem usage requires c++17

Author: GuillaumeLagrange

core/BUILD

@@ -74,10 +74,7 @@ cc_library(
     srcs = glob(["src/**/*.cpp"] + ["src/**/*.h"]),
     hdrs = glob(["include/**/*.h"] + ["include/**/*.hpp"]),
     includes = ["include"],
-    copts = select({
-        ":windows": ["/std:c++17"],
-        "//conditions:default": [],
-    }),
+    copts = ["-std=c++17"],
     defines = [
         "CODSPEED_VERSION=\\\"{}\\\"".format(CODSPEED_VERSION),
     ] + select({