[gbrainy] Remove unnecessary macros from configure.ac

[Jordi Mas <jmas src gnome org>]

commit 857169c1de82d9458dfe2c825881c6ba059659e3
Author: Jordi Mas <jmas softcatala org>
Date:   Thu Mar 8 06:52:13 2018 +0100

    Remove unnecessary macros from configure.ac

 configure.ac |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3dbd8d1..16358a6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,12 +26,8 @@ AM_MAINTAINER_MODE
 
 IT_PROG_INTLTOOL([0.35.0])
 
-AC_PROG_CC
-AC_ISC_POSIX
-AC_HEADER_STDC
 AM_PROG_LIBTOOL
 
-GNOME_COMPILE_WARNINGS
 AM_PATH_GLIB_2_0
 
 dnl --- Check for mono and mcs