Fixed a fault with posix tasks not getting their LMA correctly

conts/posix/mm0/SConscript

@@ -24,6 +24,7 @@ def generate_lma_lds(target, source, env):
     with open(source[0].path, 'r') as lds_in:
         with open(target[0].path, 'w+') as lds_out:
             linker_script = lds_in.read()
+            assert container.pager_lma != 0
             lds_out.write(linker_script % conv_hex(container.pager_lma))
 
 lma_lds = Command('include/linker.lds', 'include/linker.lds.in', generate_lma_lds)

conts/posix/test0/SConscript

@@ -48,8 +48,9 @@ env.Append(LINKFLAGS = ['-T' + lma_lds[0].path, '-u_start'])
 env.Append(CPPFLAGS = ' -D__USERSPACE__')
 objs = env.Object(src + test_exec_asm)
 test0 = env.Program('test0.elf', objs)
-
+Depends(test0, objs)
 Depends(test0, lma_lds)
+Depends(lma_lds, previmage)
 env.Depends(test0, test_exec)
 
 Return('test0')