Zephyr: CMake error when Log Management is enabled.

[NZSmartie]

Modifying samples/smp_svr/zephyr/prj.conf and adding

CONFIG_MCUMGR_CMD_LOG_MGMT=y

to the following file:

mynewt-mcumgr/samples/smp_svr/zephyr/prj.conf

Lines 34 to 38 in 7658d09

	# Enable all core commands.
	CONFIG_MCUMGR_CMD_FS_MGMT=y
	CONFIG_MCUMGR_CMD_IMG_MGMT=y
	CONFIG_MCUMGR_CMD_OS_MGMT=y
	CONFIG_MCUMGR_CMD_STAT_MGMT=y

Building the sample application with west build will cause CMake to error with the following:

CMake Error at ../../../cmd/log_mgmt/CMakeLists.txt:29:
  Parse error.  Expected "(", got newline with text "

  ".


-- Configuring incomplete, errors occurred!

The CMakesLists.txt file has a couple of errors.

mynewt-mcumgr/cmd/log_mgmt/CMakeLists.txt

Lines 18 to 28 in 7658d09

	if(CONFIG_MCUMGR)
	target_include_directories(MCUMGR INTERFACE
	include
	)
	zephyr_library_sources(
	cmd/log_mgmt/port/zephyr/src/zephyr_log_mgmt.c
	cmd/log_mgmt/src/log_mgmt.c
	cmd/log_mgmt/src/stubs.c
	)
	endif

Adding parentheses to the trailing endif (becomming endif())will fix the syntax error, but then present a new error:

CMake Error at /home/nzsmartie/projects/smartbike/zephyr/cmake/extensions.cmake:372 (add_library):
  Cannot find source file:

    /home/nzsmartie/projects/smartbike/modules/lib/mcumgr/cmd/log_mgmt/cmd/log_mgmt/port/zephyr/src/zephyr_log_mgmt.c

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx
Call Stack (most recent call first):
  /home/nzsmartie/projects/smartbike/zephyr/cmake/extensions.cmake:349 (zephyr_library_named)
  ../../../CMakeLists.txt:21 (zephyr_library)

the source files listed are prefixed with cmd/log_mgmt/ which is the directory the current CMakeLsits.txt file is in. Removing the prefix resolves the CMake errors.