[pygobject] configure.ac: remove unused PLATFORM variable

[Christoph Reiter <creiter src gnome org>]

commit 3460081ed20b33b3a08c4fce5de135f1171f2ff0
Author: Christoph Reiter <creiter src gnome org>
Date:   Sun Apr 2 15:51:25 2017 +0200

    configure.ac: remove unused PLATFORM variable
    
    This was added in 93e7d047e

 configure.ac |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ca36d92..673cd00 100644
--- a/configure.ac
+++ b/configure.ac
@@ -119,9 +119,6 @@ if test "x$link_python_libs" = "xyes"; then
   PYG_CHECK_PYTHON_LIBS(, AC_MSG_ERROR([Python libs not found. Windows requires Python modules to be 
explicitly linked to libpython.]))
 fi
 
-PLATFORM=`$PYTHON -c "import sys; from distutils import util; sys.stdout.write(util.get_platform())"`
-AC_SUBST(PLATFORM)
-
 dnl get rid of the -export-dynamic stuff from the configure flags ...
 export_dynamic=`(./libtool --config; echo eval echo \\$export_dynamic_flag_spec) | sh`