linuxdoc-tools: remove usage of FILESPATH

Fixes [YOCTO #4497]

Usage of FILESPATH is discouraged, since it can make recipes harder to
bbappend.

(From OE-Core rev: 6ffd023085f8918b7967e8b7de674f0411220382)

Signed-off-by: Petter Mabäcker <petter@technux.se>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/linuxdoc-tools/linuxdoc-tools-native_0.9.69.bb

@@ -5,7 +5,6 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=077ef64ec3ac257fb0d786531cf26931"
 
 DEPENDS = "groff-native openjade-native"
 
-
 SRC_URI = "${DEBIAN_MIRROR}/main/l/linuxdoc-tools/linuxdoc-tools_${PV}.orig.tar.gz \
            file://disable_sgml2rtf.patch \
            file://disable_txt_doc.patch \
@@ -15,8 +14,6 @@ SRC_URI = "${DEBIAN_MIRROR}/main/l/linuxdoc-tools/linuxdoc-tools_${PV}.orig.tar.
 SRC_URI[md5sum] = "1d13d500918a7a145b0edc2f16f61dd1"
 SRC_URI[sha256sum] = "7103facee18a2ea97186ca459d743d22f7f89ad4b5cd1dfd1c34f83d6bfd4101"
 
-FILESPATH = "${FILE_DIRNAME}/linuxdoc-tools-native/"
-
 inherit autotools-brokensep native
 
 do_configure () {