feat(CMakeLists): Add MSVC warning flags for ggml modules

Add MSVC warning flags to improve code quality and catch potential issues
early. The following flags have been added:
- /W4: Comprehensive warnings (similar to -Wall and some of -Wextra)
- /we4456: Declaration hides previous local declaration
- /we4457: Declaration hides function parameter
- /we4458: Declaration hides class member
- /wd4100: Unreferenced formal parameter (too noisy)
- /wd4324: Structure was padded due to alignment specifier

Author: scc-tw

ggml/src/CMakeLists.txt

@@ -74,7 +74,7 @@ if (GGML_ALL_WARNINGS)
 
         add_compile_options("$<$<COMPILE_LANGUAGE:C>:${C_FLAGS};${GF_C_FLAGS}>"
                             "$<$<COMPILE_LANGUAGE:CXX>:${CXX_FLAGS};${GF_CXX_FLAGS}>")
-    else()
+    elseif(MSVC)
         # MSVC
         list(APPEND MSVC_WARNING_FLAGS 
             /W4       # Comprehensive warnings (similar to -Wall and some of -Wextra)
@@ -86,6 +86,9 @@ if (GGML_ALL_WARNINGS)
         )
 
         add_compile_options(${MSVC_WARNING_FLAGS})
+    else()
+        set(C_FLAGS   "")
+        set(CXX_FLAGS "")
     endif()
 endif()