Removed hard coded values of toolchain and gcc cpu flags

conts/posix/libposix/SConstruct

@@ -7,13 +7,16 @@ import glob
 import sys
 from os.path import join
 from string import split
+from configure import *
+
+config = configuration_retrieve()
 
 project_root = "../.."
 kernel_headers = join(project_root, "include")
 l4lib_headers = join(project_root, "tasks/libl4/include")
 config_h = join(project_root, "include/l4/config.h")
 
-env = Environment(CC = 'arm-none-linux-gnueabi-gcc',
+env = Environment(CC = config.user_toolchain + 'gcc',
 		  CCFLAGS = ['-g', '-std=gnu99', '-nostdlib', '-ffreestanding'],
 		  LINKFLAGS = ['-nostdlib'],
 		  CPPPATH = ['#include'],