Fix build with newer autoconf (2.71)

Bug-Debian: https://bugs.debian.org/995036
Applied-Upstream: https://gitlab.haskell.org/ghc/ghc/-/commit/ad2ef3a13f1eb000eab8e3d64592373b91a52806

Gbp-Pq: Name newer-autoconf

diff --git a/aclocal.m4 b/aclocal.m4
index 5713c96c49734e55172edb21f790fb1e465a0866..fd5c7c1af92511d57ba1e50accef8a079799f8c6 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -613,7 +613,7 @@ AC_DEFUN([FP_SET_CFLAGS_C99],
     CPPFLAGS="$$3"
     unset ac_cv_prog_cc_c99
     dnl perform detection
-    _AC_PROG_CC_C99
+    AC_PROG_CC_C99
     fp_cc_c99="$ac_cv_prog_cc_c99"
     case "x$ac_cv_prog_cc_c99" in
       x)   ;; # noop