tar: set acpaths to avoid "Argument list too long" error

There would be an error when the TMPDIR is long/deep, for example when
len(TMPDIR) = 410 while our supported longest value is 410:

    aclocal: error: cannot open xxx
    autoreconf: aclocal failed with exit status: 1
    ERROR: autoreconf execution failed.

Let aclocal use the relative path for the m4 file rather than the
absolute would fix the problem.

[YOCTO #6138]

(From OE-Core rev: 747333764231d0320bdefbcf192b2589e70c58a1)

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/tar/tar.inc

@@ -10,6 +10,12 @@ inherit autotools gettext texinfo
 
 EXTRA_OECONF += "DEFAULT_RMT_DIR=${base_sbindir}"
 
+# Let aclocal use the relative path for the m4 file rather than the
+# absolute since tar has a lot of m4 files, otherwise there might
+# be an "Argument list too long" error when it is built in a long/deep
+# directory.
+acpaths = "-I ./m4"
+
 EXTRAINSTALL = "do_install_extra"
 EXTRAINSTALL_class-nativesdk = ""