Revert "For Intel Mac OS target version 10.14"

This reverts commit 4cd2f81.

build.sbt

@@ -82,13 +82,11 @@ jniGccFlags := (
  jniGccFlags.value.filterNot(_ == "-fPIC") ++
  Seq("-D_JNI_IMPLEMENTATION_", "-Wl,--kill-at",
  "-static-libgcc", "-Wl,--version-script=" + PWD + "/libzstd-jni.so.map")
- else if (System.getProperty("os.name").toLowerCase startsWith "mac") {
- // For intel, target the latest version that supported 32bit binaries
- val target = if (System.getProperty("os.arch") == "x86_64") Seq("-mmacosx-version-min=10.14") else Seq()
+ else if (System.getProperty("os.name").toLowerCase startsWith "mac")
  // MacOS uses clang that does not support the "-static-libgcc" and version scripts,
  // but visibility can be modified by `-exported_symbols_list`
- jniGccFlags.value ++ Seq("-exported_symbols_list", PWD + "/libzstd-jni.so.exported") ++ target
- } else
+ jniGccFlags.value ++ Seq("-exported_symbols_list", PWD + "/libzstd-jni.so.exported")
+ else
  // the default is compilation with GCC
  jniGccFlags.value ++ Seq(
  "-static-libgcc", "-Wl,--version-script=" + PWD + "/libzstd-jni.so.map")