[opus] non-standard alloca.h

[LRN]

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AFAIK, alloca.h is not POSIX. Here's a patch that includes alloca.h
only when it's really there.
It also includes malloc.h, which is where mingw-w64 defines the
alloca() macro, mapping it to gcc __builtin_alloca() or to msvcrt
_alloca().

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--- opus-1.1-beta/configure.ac.orig	2013-07-31 06:27:54.930255200 +0000
+++ opus-1.1-beta/configure.ac	2013-07-31 06:28:56.746104800 +0000
@@ -99,9 +99,13 @@
 
 AS_IF([test "$has_var_arrays" = "no"],
   [
    AC_CHECK_HEADERS([alloca.h])
+   AC_CHECK_HEADERS([malloc.h])
    AC_MSG_CHECKING(for alloca)
-   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <alloca.h>]],
+   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#ifdef HAVE_ALLOCA_H
+                                        #include <alloca.h>
+                                        #endif
+                                        #include <malloc.h>]],
                                       [[int foo=10; int *array = alloca(foo);]])],
      [ use_alloca=yes;
        AC_DEFINE([USE_ALLOCA], [], [Make use of alloca])