Drop use of f16c instructions (#768)

The -mf16c flag is troublesome as those instructions may not be
available on older CPUs. The clang compiler also seems to emit
AVX instructions when it is told that it can use F16C.
The flag can be dropped without consequence as rocSOLVER does not use
half precision.

This was done for rocBLAS in c6bc09073959a2881a701b88ae1ed9de469354f1.

clients/benchmarks/CMakeLists.txt

@@ -1,5 +1,5 @@
 # ##########################################################################
-# Copyright (C) 2016-2023 Advanced Micro Devices, Inc. All rights reserved.
+# Copyright (C) 2016-2024 Advanced Micro Devices, Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -37,8 +37,6 @@ target_link_libraries(rocsolver-bench PRIVATE
   roc::rocsolver
 )
 
-# Turn on f16c intrinsics
-target_compile_options(rocsolver-bench PRIVATE -mf16c)
 target_compile_definitions(rocsolver-bench PRIVATE
   ROCM_USE_FLOAT16
   ROCSOLVER_CLIENTS_BENCH

clients/gtest/CMakeLists.txt

@@ -186,8 +186,6 @@ target_link_libraries(rocsolver-test PRIVATE
   roc::rocblas
 )
 
-# Turn on f16c intrinsics
-target_compile_options(rocsolver-test PRIVATE -mf16c)
 target_compile_definitions(rocsolver-test PRIVATE
   ROCM_USE_FLOAT16
   ROCSOLVER_CLIENTS_TEST