vim: add knob whether elf.h are checked

Previously, it still was checked when there was no elf library in sysroots directory.
Add knob to decide whether elf.h are checked or not.

Fixed by using PACKAGECONFIG to check elf, with default disabled set.

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/vim/files/vim-add-knob-whether-elf.h-are-checked.patch

@@ -0,0 +1,38 @@
+vim: add knob whether elf.h are checked
+
+Previously, it still was checked when there was no elf library in sysroots directory.
+Add knob to decide whether elf.h are checked or not.
+
+Upstream-status: Pending
+
+Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
+---
+ src/configure.in |    7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/src/configure.in b/src/configure.in
+index d734064..f504fa6 100644
+--- a/src/configure.in
++++ b/src/configure.in
+@@ -2483,11 +2483,18 @@ AC_TRY_COMPILE([#include <stdio.h>], [int x __attribute__((unused));],
+ 	AC_MSG_RESULT(no))
+ 
+ dnl Checks for header files.
++AC_MSG_CHECKING(whether or not to look for elf.h)
++AC_ARG_ENABLE(elf-check,
++        [  --enable-elf-check      If elfutils, check for elf.h [default=no]],
++        , enable_elf_check="no")
++AC_MSG_RESULT($enable_elf_check)
++if test "x$enable_elf_check" != "xno"; then
+ AC_CHECK_HEADER(elf.h, HAS_ELF=1)
+ dnl AC_CHECK_HEADER(dwarf.h, SVR4=1)
+ if test "$HAS_ELF" = 1; then
+   AC_CHECK_LIB(elf, main)
+ fi
++fi
+ 
+ AC_HEADER_DIRENT
+ 
+-- 
+1.7.9.5
+

meta-oe/recipes-support/vim/vim_7.4.258.bb

@@ -8,6 +8,7 @@ LIC_FILES_CHKSUM = "file://../runtime/doc/uganda.txt;md5=b779e18be6ed77facc77069
 
 SRC_URI = "hg://vim.googlecode.com/hg/;protocol=https;module=vim \
            file://disable_acl_header_check.patch;patchdir=.. \
+           file://vim-add-knob-whether-elf.h-are-checked.patch;patchdir=.. \
 "
 SRCREV = "v7-4-258"
 
@@ -38,6 +39,7 @@ PACKAGECONFIG[acl] = "--enable-acl,--disable-acl,acl,"
 PACKAGECONFIG[x11] = "--with-x,--without-x,xt,"
 PACKAGECONFIG[tiny] = "--with-features=tiny,--with-features=big,,"
 PACKAGECONFIG[selinux] = "--enable-selinux,--disable-selinux,libselinux,"
+PACKAGECONFIG[elfutils] = "--enable-elf-check,,elfutils,"
 
 EXTRA_OECONF = " \
     --disable-gpm \