Suggestion to use find_package() over pkg_search_module() for better logs

[danfe]

Currently, in the CMakeLists.txt, most components are detected with find_package() except LibArchive and PCRE, for which pkg_search_module() is used. Both seem to work, but find_package() yields better detection output, with library path and version, if available, as shown in the excerpt from the build logs diff below:

 -- INCSRCH plugin enabled
 -- INSIDE plugin enabled
 -- MULTIARC plugin enabled
+-- Found LibArchive: /usr/local/lib/libarchive.so (found version "3.7.2") 
+-- Found PCRE: /usr/local/lib/libpcre.so  
 -- Using LibArchive for limited RAR archives support.
 -- NETROCKS plugin enabled
 -- Found OpenSSL: /usr/lib/libcrypto.so (found version "1.1.1w")