Revert "Enhance CMakeLists for MSVC OpenMP compatibility"

This reverts commit 2e2f944.

Author: Thireus

ggml/src/CMakeLists.txt

@@ -160,17 +160,7 @@ if (GGML_OPENMP)
 
         add_compile_definitions(GGML_USE_OPENMP)
 
-        # On non-MSVC platforms keep linking the imported OpenMP target
-        if (MSVC)
-            message(STATUS "MSVC detected — will request -openmp:experimental and avoid OpenMP::OpenMP_CXX to prevent /openmp being injected earlier")
-            # record a flag to apply to the ggml target later (ensures it appears last on the command line)
-            set(GGML_MSVC_OPENMP_FLAG "-openmp:experimental")
-            # Do NOT add OpenMP::OpenMP_C / CXX to GGML_EXTRA_LIBS on MSVC so that CMake's OpenMP usage requirements
-            # don't inject /openmp (which could override experimental if it appears later).
-        else()
-            # Non-MSVC: keep the imported OpenMP targets
-            set(GGML_EXTRA_LIBS ${GGML_EXTRA_LIBS} OpenMP::OpenMP_C OpenMP::OpenMP_CXX)
-        endif()
+        set(GGML_EXTRA_LIBS ${GGML_EXTRA_LIBS} OpenMP::OpenMP_C OpenMP::OpenMP_CXX)
 
         if (GGML_MUSA)
             set(GGML_EXTRA_INCLUDES ${GGML_EXTRA_INCLUDES} "/usr/lib/llvm-10/include/openmp")
@@ -1579,13 +1569,6 @@ add_library(ggml
             ggml-aarch64.c            ggml-aarch64.h
             )
 
-# Ensure MSVC experimental flag is appended to the compile options for the ggml target
-if (MSVC AND GGML_OPENMP AND DEFINED GGML_MSVC_OPENMP_FLAG)
-    message(STATUS "Appending ${GGML_MSVC_OPENMP_FLAG} to target 'ggml' compile options")
-    # Use APPEND so the flag is added after any other compile options (last wins on MSVC)
-    set_property(TARGET ggml APPEND PROPERTY COMPILE_OPTIONS "${GGML_MSVC_OPENMP_FLAG}")
-endif()
-
 if (EMSCRIPTEN)
     set_target_properties(ggml PROPERTIES COMPILE_FLAGS "-msimd128")
 endif()