If GNU make 3.81 is not found then build it as a companion tool.

Signed-off-by: Ray Donnelly <mingw.android@gmail.com>
[yann.morin.1998@free.fr: add message "checking for make 3.81"]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <8b8bf6998f3d239f6c74.1392920971@advancedsearch.virginmedia.com>
Patchwork-Id: 322302

 --- gcc-4.3.4/libffi/src/arm/sysv.S	

 +++ gcc-4.3.4/libffi/src/arm/sysv.S	

 @@ -235,7 +235,7 @@ ARM_FUNC_START ffi_closure_SYSV

  	stmfd	sp!, {ip, lr}

  	UNWIND .save	{r0, lr}

  	add	r2, sp, #8

 -	.pad #16

 +	UNWIND .pad #16

  	sub	sp, sp, #16

  	str	sp, [sp, #8]

  	add	r1, sp, #8