IAR: Use same executable suffix as try_compile

There was a mismatch in the executable suffix between the compiler
detection and try_compile. This resulted in the generated executable
having a different suffix than what try_compile was looking for.

The IAR module is changed to use the same suffix as try_compile.

Fixes: #22567

Modules/Compiler/IAR.cmake

diff --git a/Modules/Compiler/IAR.cmake b/Modules/Compiler/IAR.cmake
index 2200a21..dc48cda 100644
--- a/Modules/Compiler/IAR.cmake
+++ b/Modules/Compiler/IAR.cmake
@@ -41,7 +41,7 @@
 include_guard()
 
 macro(__compiler_iar_ilink lang)
-  set(CMAKE_EXECUTABLE_SUFFIX_${lang} ".elf")
+  set(CMAKE_EXECUTABLE_SUFFIX ".elf")
   set(CMAKE_${lang}_OUTPUT_EXTENSION ".o")
   if (${lang} STREQUAL "C" OR ${lang} STREQUAL "CXX")
     set(CMAKE_${lang}_COMPILE_OBJECT             "<CMAKE_${lang}_COMPILER> ${CMAKE_IAR_${lang}_FLAG} --silent <SOURCE> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>")
@@ -74,7 +74,7 @@
 endmacro()
 
 macro(__compiler_iar_xlink lang)
-  set(CMAKE_EXECUTABLE_SUFFIX_${lang} ".bin")
+  set(CMAKE_EXECUTABLE_SUFFIX ".bin")
   if (${lang} STREQUAL "C" OR ${lang} STREQUAL "CXX")
 
     set(CMAKE_${lang}_COMPILE_OBJECT             "<CMAKE_${lang}_COMPILER> ${CMAKE_IAR_${lang}_FLAG} --silent <SOURCE> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>")