Fixed No_AVX build on Windows

Author: sandrohanea

ggml/cmake/FindSIMD.cmake

@@ -77,24 +77,25 @@ macro(check_sse type flags)
 endmacro()
 
 # flags are for MSVC only!
-check_sse("AVX" " ;/arch:AVX")
-if (NOT ${AVX_FOUND})
-    set(GGML_AVX OFF)
-else()
-    set(GGML_AVX ON)
+# Only perform checks if the options are enabled, otherwise the params won't be respected
+if (GGML_AVX)
+    check_sse("AVX" " ;/arch:AVX")
+    if (NOT AVX_FOUND)
+        set(GGML_AVX OFF)
+    endif()
 endif()
 
-check_sse("AVX2" " ;/arch:AVX2")
-check_sse("FMA" " ;/arch:AVX2")
-if ((NOT ${AVX2_FOUND}) OR (NOT ${FMA_FOUND}))
-    set(GGML_AVX2 OFF)
-else()
-    set(GGML_AVX2 ON)
+if (GGML_AVX2)
+    check_sse("AVX2" " ;/arch:AVX2")
+    check_sse("FMA" " ;/arch:AVX2")
+    if (NOT AVX2_FOUND OR NOT FMA_FOUND)
+        set(GGML_AVX2 OFF)
+    endif()
 endif()
 
-check_sse("AVX512" " ;/arch:AVX512")
-if (NOT ${AVX512_FOUND})
-    set(GGML_AVX512 OFF)
-else()
-    set(GGML_AVX512 ON)
-endif()
+if (GGML_AVX512)
+    check_sse("AVX512" " ;/arch:AVX512")
+    if (NOT AVX512_FOUND)
+        set(GGML_AVX512 OFF)
+    endif()
+endif()