### Description

`libmnl-devel` is present in OpenSUSE but build of ims module is failed. This because headers files is located on other path then kamailio expects. `libmnl-devel` package is designed to use pkgconfig. I checked on CentOS dist `libmnl-devel` also have files for pkgconfig.

### Troubleshooting

#### Reproduction

need to build ims module on openSUSE_Leap_42.3

#### Debugging Data

NA

#### Log Messages

``` [ 333s] make[3]: 'libkamailio_ims.so.0.1' is up to date. [ 333s] LD (gcc) [M ims_ocs.so] ims_ocs.so [ 333s] CC (gcc) [M ims_diameter_server.so] ims_diameter_server.o [ 333s] CC (gcc) [M ims_diameter_server.so] cJSON.o [ 333s] CC (gcc) [M ims_diameter_server.so] avp_helper.o [ 334s] make[3]: 'libkamailio_ims.so.0.1' is up to date. [ 334s] LD (gcc) [M ims_diameter_server.so] ims_diameter_server.so [ 334s] CC (gcc) [M ims_ipsec_pcscf.so] ims_ipsec_pcscf_mod.o [ 334s] CC (gcc) [M ims_ipsec_pcscf.so] ipsec.o [ 334s] ipsec.c:32:27: fatal error: libmnl/libmnl.h: No such file or directory [ 334s] #include <libmnl/libmnl.h> [ 334s] ^ [ 334s] compilation terminated. [ 334s] ../../Makefile.rules:100: recipe for target 'ipsec.o' failed [ 334s] make[2]: *** [ipsec.o] Error 1 [ 334s] Makefile:511: recipe for target 'modules' failed [ 334s] make[1]: *** [modules] Error 1 [ 334s] make[1]: Leaving directory '/home/abuild/rpmbuild/BUILD/kamailio-5.2.0/src' [ 334s] Makefile:27: recipe for target 'every-module' failed [ 334s] make: *** [every-module] Error 2 [ 334s] error: Bad exit status from /var/tmp/rpm-tmp.Yi6mZQ (%build) [ 334s] ```

#### SIP Traffic

NA

### Possible Solutions

Not known

### Additional Information

master branch

* **Operating System**: openSUSE_Leap_42.3