boot/mcuboot: Fix inclusion of more than one example app

Even though the options existed, the second application would override
the values, resulting in the missing first application on the final
binary.

Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>

boot/mcuboot/Makefile

@@ -31,23 +31,27 @@ VPATH   += :$(MCUBOOT_UNPACK)$(DELIM)src
 VPATH   += :$(MCUBOOT_SRCDIR)
 
 ifneq ($(CONFIG_MCUBOOT_UPDATE_AGENT_EXAMPLE),)
-MAINSRC   = mcuboot_agent_main.c
-
-PROGNAME  = mcuboot_agent
-PRIORITY  = SCHED_PRIORITY_DEFAULT
-STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
-else ifneq ($(CONFIG_MCUBOOT_SLOT_CONFIRM_EXAMPLE),)
-MAINSRC   = mcuboot_confirm_main.c
-
-PROGNAME  = mcuboot_confirm
-PRIORITY  = SCHED_PRIORITY_DEFAULT
-STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
-else ifneq ($(CONFIG_MCUBOOT_BOOTLOADER),)
-MAINSRC   = mcuboot/boot/nuttx/main.c
-
-PROGNAME  = mcuboot_loader
-PRIORITY  = SCHED_PRIORITY_DEFAULT
-STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
+MAINSRC   += mcuboot_agent_main.c
+
+PROGNAME  += mcuboot_agent
+PRIORITY  += SCHED_PRIORITY_DEFAULT
+STACKSIZE += $(CONFIG_DEFAULT_TASK_STACKSIZE)
+endif
+
+ifneq ($(CONFIG_MCUBOOT_SLOT_CONFIRM_EXAMPLE),)
+MAINSRC   += mcuboot_confirm_main.c
+
+PROGNAME  += mcuboot_confirm
+PRIORITY  += SCHED_PRIORITY_DEFAULT
+STACKSIZE += $(CONFIG_DEFAULT_TASK_STACKSIZE)
+endif
+
+ifneq ($(CONFIG_MCUBOOT_BOOTLOADER),)
+MAINSRC   += mcuboot/boot/nuttx/main.c
+
+PROGNAME  += mcuboot_loader
+PRIORITY  += SCHED_PRIORITY_DEFAULT
+STACKSIZE += $(CONFIG_DEFAULT_TASK_STACKSIZE)
 endif
 
 CFLAGS += -Wno-undef