refactor: error headers and unused cast

Signed-off-by: Krishna Pandey <[email protected]>

Author: krishna2803

libc/test/src/math/smoke/CMakeLists.txt

@@ -4338,11 +4338,10 @@ add_fp_unittest(
   SRCS
     log_bf16_test.cpp
   DEPENDS
+    libc.hdr.errno_macros
     libc.hdr.fenv_macros
-    libc.src.errno.errno
     libc.src.math.log_bf16
     libc.src.__support.FPUtil.bfloat16
-    libc.src.__support.FPUtil.cast
 )
 
 add_fp_unittest(

libc/test/src/math/smoke/log_bf16_test.cpp

@@ -6,10 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "hdr/errno_macros.h"
 #include "hdr/fenv_macros.h"
 #include "src/__support/FPUtil/bfloat16.h"
-#include "src/__support/FPUtil/cast.h"
-#include "src/__support/libc_errno.h"
 #include "src/__support/macros/properties/types.h"
 #include "src/math/log_bf16.h"
 #include "test/UnitTest/FPMatcher.h"