[gnome-online-accounts/wip/rishi/drop-ac-isc-posix] build: Remove AC_ISC_POSIX

[Debarshi Ray <debarshir src gnome org>]

commit 8cfe8a187fe864d2ecbd8cfc01cd782c1cbd7c6e
Author: Debarshi Ray <debarshir gnome org>
Date:   Sat Feb 1 19:40:23 2020 +0100

    build: Remove AC_ISC_POSIX
    
    The AC_ISC_POSIX macro is obsolete:
    https://www.gnu.org/software/autoconf/manual/autoconf-2.61/html_node/Posix-Variants.html

 configure.ac | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 373816b1..fcf63dd9 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_ISC_POSIX
 AC_HEADER_STDC
 AC_PROG_LIBTOOL