vpnc: add alpine patch to fix musl.

srcpkgs/vpnc/patches/0001-fix-musl.patch

@@ -0,0 +1,32 @@
+diff --git sysdep.c sysdep.c
+index ff07753..43fdb74 100644
+--- sysdep.c
++++ sysdep.c
+@@ -59,7 +59,7 @@
+ #if defined(__DragonFly__)
+ #include <net/tun/if_tun.h>
+ #elif defined(__linux__)
+-#include <linux/if_tun.h>
++/*#include <linux/if_tun.h>*/
+ #elif defined(__APPLE__)
+ /* no header for tun */
+ #elif defined(__CYGWIN__)
+diff --git sysdep.h sysdep.h
+index a5eafd6..af34e94 100644
+--- sysdep.h
++++ sysdep.h
+@@ -38,11 +38,13 @@ int tun_get_hwaddr(int fd, char *dev, uint8_t *hwaddr);
+ 
+ /***************************************************************************/
+ #if defined(__linux__) || defined(__GLIBC__)
++#ifdef __GLIBC__
+ #include <error.h>
++#define HAVE_ERROR     1
++#endif
+ 
+ #define HAVE_VASPRINTF 1
+ #define HAVE_ASPRINTF  1
+-#define HAVE_ERROR     1
+ #define HAVE_GETLINE   1
+ #define HAVE_UNSETENV  1
+ #define HAVE_SETENV    1

srcpkgs/vpnc/template

@@ -1,7 +1,7 @@
 # Template file for 'vpnc'
 pkgname=vpnc
 version=0.5.3
-revision=3
+revision=4
 hostmakedepends="perl"
 makedepends="libgcrypt-devel"
 depends="net-tools"