kernel-libc-headers: apply patches from Alpine.

The patches have been updated for 3.18.6 and should fix build issues
with code that includes netinet/in6.h and linux headers (among others).

srcpkgs/kernel-libc-headers/patches/1-4-glibc-specific-inclusion-of-sysinfo.h-in-kernel.h.patch

@@ -0,0 +1,12 @@
+--- ./include/uapi/linux/kernel.h.orig
++++ ./include/uapi/linux/kernel.h
+@@ -1,7 +1,9 @@
+ #ifndef _UAPI_LINUX_KERNEL_H
+ #define _UAPI_LINUX_KERNEL_H
+ 
++#ifdef __GLIBC__
+ #include <linux/sysinfo.h>
++#endif
+ 
+ /*
+  * 'kernel.h' contains some often-used function prototypes etc

srcpkgs/kernel-libc-headers/patches/3-4-libc-compat.h-fix-some-issues-arising-from-in6.h.patch

@@ -0,0 +1,60 @@
+--- include/uapi/linux/libc-compat.h.orig	2015-05-31 15:43:30.635620792 +0200
++++ include/uapi/linux/libc-compat.h	2015-05-31 15:48:08.787163241 +0200
+@@ -48,30 +48,27 @@
+ #ifndef _UAPI_LIBC_COMPAT_H
+ #define _UAPI_LIBC_COMPAT_H
+ 
+-/* We have included glibc headers... */
+-#if defined(__GLIBC__)
++#ifndef __KERNEL__ /* we're used from userspace */
+ 
+-/* Coordinate with glibc netinet/in.h header. */
+-#if defined(_NETINET_IN_H)
++#ifdef _NETINET_IF_ETHER_H /* musl */
++#define __UAPI_DEF_ETHHDR 0
++#else /* glibc uses __NETINET_IF_ETHER_H, and includes the kernel header. */
++#define __UAPI_DEF_ETHHDR 1
++#endif
++
++/* Coordinate with libc netinet/in.h header. */
++#ifdef _NETINET_IN_H
+ 
+ /* GLIBC headers included first so don't define anything
+  * that would already be defined. */
+ #define __UAPI_DEF_IN6_ADDR		0
+-/* The exception is the in6_addr macros which must be defined
+- * if the glibc code didn't define them. This guard matches
+- * the guard in glibc/inet/netinet/in.h which defines the
+- * additional in6_addr macros e.g. s6_addr16, and s6_addr32. */
+-#if defined(__USE_MISC) || defined (__USE_GNU)
+ #define __UAPI_DEF_IN6_ADDR_ALT		0
+-#else
+-#define __UAPI_DEF_IN6_ADDR_ALT		1
+-#endif
+ #define __UAPI_DEF_SOCKADDR_IN6		0
+ #define __UAPI_DEF_IPV6_MREQ		0
+ #define __UAPI_DEF_IPPROTO_V6		0
+ #define __UAPI_DEF_IPV6_OPTIONS		0
+ 
+-#else
++#else /* defined(_NETINET_IN_H) */
+ 
+ /* Linux headers included first, and we must define everything
+  * we need. The expectation is that glibc will check the
+@@ -97,7 +94,7 @@
+ /* If we did not see any headers from any supported C libraries,
+  * or we are being included in the kernel, then define everything
+  * that we need. */
+-#else /* !defined(__GLIBC__) */
++#else /* __KERNEL__ */
+ 
+ /* Definitions for in6.h */
+ #define __UAPI_DEF_IN6_ADDR		1
+@@ -110,6 +107,6 @@
+ /* Definitions for xattr.h */
+ #define __UAPI_DEF_XATTR		1
+ 
+-#endif /* __GLIBC__ */
++#endif /* __KERNEL__ */
+ 
+ #endif /* _UAPI_LIBC_COMPAT_H */

srcpkgs/kernel-libc-headers/patches/4-4-libc-compat.h-prevent-redefinition-of-struct-ethhdr.patch

@@ -0,0 +1,24 @@
+--- include/uapi/linux/if_ether.h.orig	2015-05-31 15:46:25.659328508 +0200
++++ include/uapi/linux/if_ether.h	2015-05-31 15:47:19.843238460 +0200
+@@ -22,6 +22,7 @@
+ #define _UAPI_LINUX_IF_ETHER_H
+ 
+ #include <linux/types.h>
++#include <linux/libc-compat.h>
+ 
+ /*
+  *	IEEE 802.3 Ethernet magic constants.  The frame sizes omit the preamble
+@@ -134,11 +135,12 @@
+  *	This is an Ethernet frame header.
+  */
+ 
++#if __UAPI_DEF_ETHHDR
+ struct ethhdr {
+ 	unsigned char	h_dest[ETH_ALEN];	/* destination eth addr	*/
+ 	unsigned char	h_source[ETH_ALEN];	/* source ether addr	*/
+ 	__be16		h_proto;		/* packet type ID field	*/
+ } __attribute__((packed));
+-
++#endif
+ 
+ #endif /* _UAPI_LINUX_IF_ETHER_H */

srcpkgs/kernel-libc-headers/template

@@ -2,7 +2,7 @@
 #
 pkgname=kernel-libc-headers
 version=3.18.6
-revision=1
+revision=2
 bootstrap=yes
 nostrip=yes
 noverifyrdeps=yes