revert : cmake : set MSVC to use UTF-8 on source files (ggml-org#2346)

This reverts commit c96906d.

Author: ggerganov

CMakeLists.txt

@@ -15,11 +15,6 @@ if (NOT XCODE AND NOT MSVC AND NOT CMAKE_BUILD_TYPE)
     set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
 endif()
 
-# If MSVC set utf-8 encoding
-if (MSVC)
-    add_compile_options(/utf-8)
-endif()
-
 # Add path to modules
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")