open-vm-tools: Add new package open-vm-tools

Add new package,
open-vm-tools is Open Virtual Machine Tools for VMware guest OS

tested: OpenWrt master and 18.06.2 (x86_64) on ESXi 6.5, 6.7

Signed-off-by: Yuhei OKAWA <tochiro.srchack@gmail.com>

utils/open-vm-tools/patches/0003-Use-configure-test-for-struct-timespec.patch

@@ -0,0 +1,29 @@
+diff -urN a/configure.ac b/configure.ac
+--- a/configure.ac
++++ b/configure.ac
+@@ -1208,6 +1208,7 @@
+ AC_TYPE_PID_T
+ AC_TYPE_SIZE_T
+ AC_CHECK_MEMBERS([struct stat.st_rdev])
++AC_CHECK_MEMBERS([struct timespec.tv_sec],[],[],[[#include <time.h>]])
+ AC_HEADER_TIME
+ AC_STRUCT_TM
+ AC_C_VOLATILE
+diff -urN a/lib/include/hgfsUtil.h b/lib/include/hgfsUtil.h
+--- a/lib/include/hgfsUtil.h
++++ b/lib/include/hgfsUtil.h
+@@ -53,13 +53,7 @@
+ #      include <time.h>
+ #   endif
+ #   include "vm_basic_types.h"
+-#   if !defined _STRUCT_TIMESPEC &&   \
+-       !defined _TIMESPEC_DECLARED && \
+-       !defined __timespec_defined && \
+-       !defined sun && \
+-       !defined __FreeBSD__ && \
+-       !__APPLE__ && \
+-       !defined _WIN32
++#   if !defined HAVE_STRUCT_TIMESPEC_TV_SEC
+ struct timespec {
+    time_t tv_sec;
+    long   tv_nsec;