util/crossgcc: Add patch for __alloca missing on ubuntu 18.04

Bring this over from the HEADS repo.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I36dc9860f4c4a2675fd3fa24fa3e534215ceb43e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35724
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/crossgcc/patches/make-4.2.1_alloca.patch

@@ -0,0 +1,11 @@
+--- clean/make-4.2/glob/glob.c	2013-10-20 17:14:38.000000000 +0000
++++ make-4.2/glob/glob.c	2018-09-18 10:16:03.860886356 +0000
+@@ -208,7 +208,7 @@
+ #endif /* __GNU_LIBRARY__ || __DJGPP__ */
+ 
+ 
+-#if !defined __alloca && !defined __GNU_LIBRARY__
++#if !defined __alloca && defined __GNU_LIBRARY__
+ 
+ # ifdef	__GNUC__
+ #  undef alloca