pkg/jerryscript: update jerryscript package with the latest version (56802c22)

Also disabled to build jerry-libm because it is unused.

pkg/jerryscript/Makefile.jerryscript

@@ -18,6 +18,7 @@ libjerry:
 	 -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain_external.cmake \
 	 -DJERRY_LIBC=OFF \
 	 -DJERRY_CMDLINE=OFF \
+	 -DJERRY_LIBM=OFF \
 	 -DENABLE_ALL_IN_ONE=OFF \
 	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR="$(MCPU)" \
 	 -DEXTERNAL_CMAKE_C_COMPILER=$(CC) \
@@ -25,7 +26,8 @@ libjerry:
 	 -DEXTERNAL_COMPILE_FLAGS="$(EXT_CFLAGS)" \
 	 -DMEM_HEAP_SIZE_KB=$(JERRYHEAP)
 
-	make -C $(BUILD_DIR) jerry-core
+	make -C $(BUILD_DIR) jerry-core jerry-port-default-minimal
 	cp $(BUILD_DIR)/lib/libjerry-core.a $(BINDIR)/jerryscript.a
+	cp $(BUILD_DIR)/lib/libjerry-port-default-minimal.a $(BINDIR)/jerryport-minimal.a
 
 include $(RIOTBASE)/Makefile.base