gstreamer-plugins-nvjpeg: rework definition of S

Move S to the top-level directory in the tarball, and use the
AUTOTOOLS_SCRIPT_PATH variable to locate the configure script,
so the header files show up under ${S} and get packaged with
the rest of the sources.  Adjust the include path and patch
to account for the change.

This prevents the build path from showing up in the -dbg
packages.

Signed-off-by: Matt Madison <matt@madison.systems>

recipes-multimedia/gstreamer/gstreamer1.0-plugins-nvjpeg/use-nvjpeg-for-plugin-name.patch

@@ -1,7 +1,7 @@
-Index: gst-jpeg-1.0/ext/jpeg/Makefile.am
+Index: gstjpeg_src/gst-jpeg/gst-jpeg-1.0/ext/jpeg/Makefile.am
 ===================================================================
---- gst-jpeg-1.0.orig/ext/jpeg/Makefile.am
-+++ gst-jpeg-1.0/ext/jpeg/Makefile.am
+--- gstjpeg_src/gst-jpeg/gst-jpeg-1.0.orig/ext/jpeg/Makefile.am
++++ gstjpeg_src/gst-jpeg/gst-jpeg-1.0/ext/jpeg/Makefile.am
 @@ -1,16 +1,16 @@
 -plugin_LTLIBRARIES = libgstjpeg.la
 +plugin_LTLIBRARIES = libgstnvjpeg.la

recipes-multimedia/gstreamer/gstreamer1.0-plugins-nvjpeg_1.14.0-r35.1.0.bb

@@ -10,8 +10,9 @@ SRC_URI += "file://use-nvjpeg-for-plugin-name.patch"
 
 DEPENDS = "gstreamer1.0 gstreamer1.0-plugins-base libjpeg-turbo tegra-libraries-multimedia tegra-libraries-multimedia-utils"
 
-S = "${WORKDIR}/gstjpeg_src/gst-jpeg/gst-jpeg-1.0"
-CFLAGS += "-I${WORKDIR}/gstjpeg_src/nv_headers -DUSE_TARGET_TEGRA"
+S = "${WORKDIR}/gstjpeg_src"
+AUTOTOOLS_SCRIPT_PATH = "${S}/gst-jpeg/gst-jpeg-1.0"
+CFLAGS += "-I${S}/nv_headers -DUSE_TARGET_TEGRA"
 EXTRA_OECONF = "--disable-examples"
 EXTRA_OEMAKE = "JPEG_LIBS=-lnvjpeg"