[gnome-applets] build: remove obsolete macros

[Alberts Muktupāvels <muktupavels src gnome org>]

commit dd51cca940510fc51bfc7af8c542c829fd6d41bc
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Feb 27 11:18:29 2022 +0200

    build: remove obsolete macros
    
    We still need to define TIME_WITH_SYS_TIME for libgtop.

 configure.ac | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1bb113bd6..0b8d92414 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,7 +60,7 @@ dnl **************************************************************************
 dnl libgtop uses TIME_WITH_SYS_TIME in global.h
 dnl **************************************************************************
 
-AC_HEADER_TIME
+AC_DEFINE([TIME_WITH_SYS_TIME], [1], [Define to 1 for libgtop])
 
 dnl ***************************************************************************
 dnl *** Minimum library versions for GNOME Applets                          ***
@@ -89,7 +89,6 @@ if test x$GLIB_COMPILE_RESOURCES = xno; then
 fi
 
 AC_PROG_CC
-AC_ISC_POSIX
 AC_PATH_XTRA
 
 X_LIBS="$X_LIBS $X_PRE_LIBS -lX11 $X_EXTRA_LIBS"