Fix up handling of the Kerberos package.

On Ubuntu 16.04, and possibly other versions of Ubuntu, and on Debian
and other Debian derivatives, packages for MIT and Heimdal Kerberos can
both be installed at the same time - including developer packages.
Collisions between headers and libraries are handled by putting them in
subdirectories of the system include and library directory and having
their .pc files add -isystem flags to point to the appropriate include
directory and -L flags to point to the appropriate library directory.

CMake's pkg-config support, however, only looks for -I flags, not
-isystem flags, in pkg-config output (using --cflags-only-I), so it
doesn't get the directory in which to look for the headers, and just
uses the results of --libs-only-l to get a list of library names and
does nothing with the results of --libs-only-L, causing it not to look
for libraries in the directory in which to look for the libraries.

We fix this by:

If FindKERBEROS.cmake found Kerberos with pkg-config, have it set
KERBEROS_DEFINITIONS to the "other" compiler flags, which includes the
-isystem flag.

For all packages, adding the <PACKAGE>_DEFINITIONS values to
CMAKE_C_FLAGS and CMAKE_CXX_FLAGS so that they're used when compiling.

If FindKERBEROS.cmake found Kerberos with pkg-config, having it search
for each of the libraries in KERBEROS_LIBRARIES using find_library()
with KERBEROS_LIBDIR and KERBEROS_LIBRARY_DIRS as hints, and
re-assembling the resulting full paths into KERBEROS_LIBRARIES.

Change-Id: Ie18b56b76934f542bd12dc737631c0190026d18a
Reviewed-on: https://code.wireshark.org/review/27071
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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