package/vde2: fix build with BR2_OPTIMIZE_0

Fix the following build failure with BR2_OPTIMIZE_0:

/home/autobuild/autobuild/instance-11/output-1/host/lib/gcc/mips64-buildroot-linux-uclibc/10.3.0/../../../../mips64-buildroot-linux-uclibc/bin/ld: vde_l3.o: in function `ip_output_ready':
vde_l3.c:(.text+0xb30): undefined reference to `iphead'

Fixes:
 - http://autobuild.buildroot.org/results/5eeefcdac0b8974a424a885fdc2e82f7cb4b617d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 68ef4e546dcdade5fc768fbebf9e064f5240db2d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/vde2/0003-vde_l3-Add-static-to-inline-functions.patch

@@ -0,0 +1,37 @@
+vde_l3: Add static to inline functions
+
+Add static to inline functions to avoid the following build failure
+with BR2_OPTIMIZE_0:
+
+/home/autobuild/autobuild/instance-11/output-1/host/lib/gcc/mips64-buildroot-linux-uclibc/10.3.0/../../../../mips64-buildroot-linux-uclibc/bin/ld: vde_l3.o: in function `ip_output_ready':
+vde_l3.c:(.text+0xb30): undefined reference to `iphead'
+
+Fixes:
+ - http://autobuild.buildroot.org/results/5eeefcdac0b8974a424a885fdc2e82f7cb4b617d
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+
+diff -Nura vde2-2.3.2.orig/src/vde_l3/vde_l3.c vde2-2.3.2/src/vde_l3/vde_l3.c
+--- vde2-2.3.2.orig/src/vde_l3/vde_l3.c	2022-04-21 11:05:17.393452698 +0200
++++ vde2-2.3.2/src/vde_l3/vde_l3.c	2022-04-21 11:10:36.509804404 +0200
+@@ -100,17 +100,17 @@
+ };
+ 
+ 
+-inline struct vde_ethernet_header *ethhead(struct vde_buff *vdb)
++static inline struct vde_ethernet_header *ethhead(struct vde_buff *vdb)
+ {
+ 	return (struct vde_ethernet_header*)(vdb->data);
+ }
+ 
+-inline struct iphdr *iphead(struct vde_buff *vdb)
++static inline struct iphdr *iphead(struct vde_buff *vdb)
+ {
+ 	return (struct iphdr*)(vdb->data + 14);
+ }
+ 
+-inline void *payload(struct vde_buff *vdb)
++static inline void *payload(struct vde_buff *vdb)
+ {
+ 	return (uint8_t*)(vdb->data + 14 + sizeof(struct iphdr));
+ }