Fix build error due to bool keyword with gcc-15
* gcc-15 uses gnu23 for c.
'bool' is a keyword.
TOPDIR/tmp/work/core2-64-oe-linux/paho-mqtt-c/1.3.14/git/src/MQTTPacket.h:31:22: error: 'bool' cannot be defined via 'typedef'
31 | typedef unsigned int bool;
| ^~~~
TOPDIR/tmp/work/core2-64-oe-linux/paho-mqtt-c/1.3.14/git/src/MQTTPacket.h:31:22: note: 'bool' is a keyword with '-std=c23' onwards
TOPDIR/tmp/work/core2-64-oe-linux/paho-mqtt-c/1.3.14/git/src/MQTTPacket.h:31:1: warning: useless type name in empty declaration
31 | typedef unsigned int bool;
| ^~~~~~~
Signed-off-by: mark.yang <mark.yang@lge.com>
Signed-off-by: markyang92 <pllpokko@alumni.kaist.ac.kr>