[libxslt/rburton-master-patch-57542] build: don't check for ansidecl.h

[Ross Burton <rburton src gnome org>]

commit f7d8efbc7a250902b0f2e099821fea3c0ee5800a
Author: Ross Burton <ross burtonini com>
Date:   Tue Apr 2 16:15:59 2019 +0000

    build: don't check for ansidecl.h
    
    This is an internal GCC header that serves no purpose being checked for.
    
    The same header has already been removed from libxml2: 
https://gitlab.gnome.org/GNOME/libxml2/commit/ff628d46a1301d76e0217c23c7ef53c5f1faed45.

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index ae643387..0780bc80 100644
--- a/configure.ac
+++ b/configure.ac
@@ -168,7 +168,7 @@ dnl
 dnl Math detection
 dnl
 
-AC_CHECK_HEADERS(ieeefp.h nan.h math.h fp_class.h float.h ansidecl.h)
+AC_CHECK_HEADERS(ieeefp.h nan.h math.h fp_class.h float.h)
 AC_CHECK_HEADERS(sys/timeb.h time.h sys/stat.h sys/select.h stdarg.h)
 AC_CHECK_HEADERS(errno.h)
 AC_CHECK_FUNCS(stat _stat)