[gnome-online-accounts] build: Remove AC_HEADER_STDC

[Debarshi Ray <debarshir src gnome org>]

commit 18f65ebb20ec85ec2807ad3d4b67dc704f30b987
Author: Debarshi Ray <debarshir gnome org>
Date:   Sat Feb 1 19:53:37 2020 +0100

    build: Remove AC_HEADER_STDC
    
    The AC_HEADER_STDC macro is obsolete:
    https://www.gnu.org/software/autoconf/manual/autoconf-2.67/html_node/Particular-Headers.html
    
    https://gitlab.gnome.org/GNOME/gnome-online-accounts/merge_requests/44

 configure.ac | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index fcf63dd9..a8517acc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,6 @@ AX_COMPILER_FLAGS([WARN_CFLAGS],
                   [-Wno-cast-function-type -Wno-error=cast-function-type])
 
 AC_PROG_CC
-AC_HEADER_STDC
 AC_PROG_LIBTOOL
 
 PKG_PROG_PKG_CONFIG(0.16)