[libc]: Remove -Wglobal-constructors for libc tests (#131485)

* Relates to: llvm/llvm-project#119281
* Removes `-Wglobal-constructors` as per:
llvm/llvm-project#131485 (review)

Author: vinay-deshmukh

libc/cmake/modules/LLVMLibCTestRules.cmake

@@ -57,7 +57,6 @@ function(_get_common_test_compile_options output_var c_test flags)
       list(APPEND compile_options "-Wnewline-eof")
       list(APPEND compile_options "-Wnonportable-system-include-path")
       list(APPEND compile_options "-Wthread-safety")
-      # list(APPEND compile_options "-Wglobal-constructors")
     endif()
   endif()
   set(${output_var} ${compile_options} PARENT_SCOPE)