[libomptarget] Drop remote plugin cmake version requirement to match llvm

LLVM docs at https://llvm.org/docs/CMake.html#quick-start state 3.13.4

Reviewed By: atmnpatel

Differential Revision: https://reviews.llvm.org/D113271

GitOrigin-RevId: 4f4c826e756b84cf494ff570b6ba048b37e11713
diff --git a/libomptarget/plugins/remote/src/CMakeLists.txt b/libomptarget/plugins/remote/src/CMakeLists.txt
index de3177f..f688bdd 100644
--- a/libomptarget/plugins/remote/src/CMakeLists.txt
+++ b/libomptarget/plugins/remote/src/CMakeLists.txt
@@ -10,7 +10,7 @@
 #
 ##===----------------------------------------------------------------------===##
 
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.13.4)
 
 # Define the suffix for the runtime messaging dumps.
 add_definitions(-DTARGET_NAME=RPC)