MT#55283 Fix deb build

/usr/include/mosquitto/libcommon_cjson.h:31:10: fatal error: cjson/cJSON.h: No such file or directory
   31 | #include <cjson/cJSON.h>
      |          ^~~~~~~~~~~~~~~

Temporary until Sid packaging is fixed.

Closes #2101

Change-Id: I485835400634c0d4a32732118aa936eeb8cb9f0f
Ref: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1135697
(cherry picked from commit 868cafbbc1)

debian/control

@@ -15,6 +15,7 @@ Build-Depends:
  libavutil-dev (>= 6:10),
  libbcg729-dev <!pkg.ngcp-rtpengine.nobcg729>,
  libbencode-perl,
+ libcjson-dev,
  libcrypt-openssl-rsa-perl,
  libcrypt-rijndael-perl,
  libcurl4-openssl-dev | libcurl4-gnutls-dev,