[glibc/azanella/clang] math: Do not use __builtin_fpclassify on clang

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2d24531a61f3cf868a42b218582ea337b64c598d

commit 2d24531a61f3cf868a42b218582ea337b64c598d
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Apr 1 16:54:55 2022 -0300

    math: Do not use __builtin_fpclassify on clang
    
    It does not handle pseudo normal numbers.

Diff:
---
 math/math.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/math/math.h b/math/math.h
index e1d266f4b3..97e4df863e 100644
--- a/math/math.h
+++ b/math/math.h
@@ -955,8 +955,7 @@ enum
    the __SUPPORT_SNAN__ check may be skipped for those versions.  */
 
 /* Return number of classification appropriate for X.  */
-# if ((__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__)		      \
-      || __glibc_clang_prereq (2,8))					      \
+# if ((__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__))		      \
      && (!defined __OPTIMIZE_SIZE__ || defined __cplusplus)
      /* The check for __cplusplus allows the use of the builtin, even
 	when optimization for size is on.  This is provided for
@@ -997,8 +996,7 @@ enum
 # endif
 
 /* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN.  */
-# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__) \
-     || __glibc_clang_prereq (2,8)
+# if (__GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__)
 #  define isnormal(x) __builtin_isnormal (x)
 # else
 #  define isnormal(x) (fpclassify (x) == FP_NORMAL)