[sr-dev] [kamailio/kamailio] support pkg-config when detecting libxml2 (#2199)

[Daniel-Constantin Mierla]

I see that 26 modules use it in Makefile.

On the other hand, on macos, the output of xml2-config and pkg-config are different:

```
$ xml2-config --libs
-L/opt/local/lib -lxml2 -L/opt/local/lib -lz -L/opt/local/lib -llzma -lpthread -liconv -L/opt/local/lib -licui18n -licuuc -licudata -lm

$ which xml2-config
/opt/local/bin/xml2-config

$ pkg-config --libs libxml-2.0
-L/opt/local/lib -lxml2

$ which pkg-config
/opt/local/bin/pkg-config
```

On debian 10 is the same.

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