compiler-rt: Fix FLOAT16 feature detection

CMAKE_TRY_COMPILE_TARGET_TYPE defaults to EXECUTABLE, which causes
any feature detection code snippet without a main function to fail,
so we need to make sure it gets explicitly set to STATIC_LIBRARY.

Bug: ROCm/rocFFT#439
Bug: ROCm/rocBLAS#1350
Bug: https://bugs.gentoo.org/916069
Closes: #69842

Reviewed by: thesamesam, mgorny

Author: tstellar

compiler-rt/lib/builtins/CMakeLists.txt

@@ -5,7 +5,6 @@
 if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   cmake_minimum_required(VERSION 3.20.0)
 
-  set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
   project(CompilerRTBuiltins C ASM)
   set(COMPILER_RT_STANDALONE_BUILD TRUE)
   set(COMPILER_RT_BUILTINS_STANDALONE_BUILD TRUE)
@@ -57,6 +56,8 @@ if (COMPILER_RT_STANDALONE_BUILD)
     ON)
 endif()
 
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
 include(builtin-config-ix)
 include(CMakeDependentOption)
 include(CMakePushCheckState)