[OpenMP][Libomptarget] Fix cmake error on remote plugin

Requiring 3.15 causes a build breakage, I'm sure none of the contents actually require
3.15 or above.

Differential Revision: https://reviews.llvm.org/D95474

GitOrigin-RevId: 810572cc96e99b5d6fb695f1f047c2ae6507831b
diff --git a/libomptarget/plugins/remote/CMakeLists.txt b/libomptarget/plugins/remote/CMakeLists.txt
index c6e0775..1baa112 100644
--- a/libomptarget/plugins/remote/CMakeLists.txt
+++ b/libomptarget/plugins/remote/CMakeLists.txt
@@ -9,8 +9,6 @@
 #
 ##===----------------------------------------------------------------------===#
 
-cmake_minimum_required(VERSION 3.15)
-
 if (NOT(CMAKE_SYSTEM_NAME MATCHES "Linux"))
   libomptarget_say("Not building remote offloading plugin: only support Linux hosts.")
   return()