Summary: minor, provide C11 check for anonymous structs

Summary: minor, provide C11 check for anonymous structs
Keywords: bldchn

This changeset provides a check for anon structs, an on-and-off feature
of gcc, and mandatory for C11 support.

* m4/sxe-compiler.m4 (SXE_CHECK_ANON_STRUCTS): simply check if anon
  structs are possible, they ought to be when -std=gnu1x is selected but
  that's only possible in gcc 4.6.1 it seems.

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>