swupdate: fix non-parallel build

Building swupdate with '-j1' fails with:

swupdate$ make -j1
scripts/kconfig/conf  --silentoldconfig Kconfig
  CC      ipc/network_ipc.o
  CC      ipc/network_ipc-if.o
  CC      ipc/progress_ipc.o
  LD      ipc/built-in.o
  LD      libswupdate.so.0.1
Failed:
aarch64-dey-linux/11.3.0/ld: cannot find ipc-static/lib.a: No such file or directory
collect2: error: ld returned 1 exit status

That's due to trying to link a static library that has not been compiled
yet. That dependence seems spurious and we added it in a patch, so
remove it to fix non-parallel builds.

https://onedigi.atlassian.net/browse/DEL-8445

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-support/swupdate/swupdate/0001-Makefile-change-Makefile-to-build-swupdate-library-s.patch

@@ -5,19 +5,19 @@ Subject: [PATCH] Makefile: change Makefile to build swupdate library
 
 Signed-off-by: Mike Engel <Mike.Engel@digi.com>
 ---
- Makefile                    | 4 +++-
+ Makefile                    | 2 ++
  ipc-static/Makefile         | 6 ++++++
  ipc-static/network_ipc-if.c | 1 +
  ipc-static/network_ipc.c    | 1 +
  ipc-static/progress_ipc.c   | 1 +
- 5 files changed, 12 insertions(+), 1 deletion(-)
+ 5 files changed, 11 insertions(+)
  create mode 100644 ipc-static/Makefile
  create mode 120000 ipc-static/network_ipc-if.c
  create mode 120000 ipc-static/network_ipc.c
  create mode 120000 ipc-static/progress_ipc.c
 
 diff --git a/Makefile b/Makefile
-index 09d03a3..080b834 100644
+index 09d03a3..f34810b 100644
 --- a/Makefile
 +++ b/Makefile
 @@ -364,6 +364,7 @@ include $(srctree)/Makefile.flags
@@ -28,15 +28,6 @@ index 09d03a3..080b834 100644
  bindings-y	:= bindings
  tools-y		:= tools
  
-@@ -437,7 +438,7 @@ quiet_cmd_shared = LD      $@
-       "-shared -Wl,-soname,$@" \
-       "$(KBUILD_CFLAGS) $(CFLAGS_swupdate)" \
-       "$(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_swupdate) -L$(objtree)" \
--      "$(2)" \
-+      "$(2) ipc-static/lib.a" \
- 	  "" \
- 	  "$(LDLIBS)"
- 
 @@ -480,6 +481,7 @@ install: all
  	install -m 0644 $(srctree)/include/progress_ipc.h ${DESTDIR}/${INCLUDEDIR}
  	install -m 0755 $(objtree)/${swupdate-ipc-lib} ${DESTDIR}/${LIBDIR}