Implemented a stripped down (and so far untested)
dladdr()-implementation
using AIX' own loadquery()-function. Following the SGI example in the
same
code, the DL_info only has the dli_fname member. As the scope of
dlfcn_pathbyaddr() is the filename, this implementation does not
consider
archive members, which can be dlopen()ed in AIX. It is also leaking
memory
as it provides a copy of ldinfo_filename.

Signed-off-by: Matthias Kraft <[email protected]>

Fixed thinko in calculation of next ld_info entry. Changed to large
fixed
size ld_info buffer, as the ld_info entries are of dynamic size. The 80k
will still hold 32 entries in a worst case scenario.
The implementation can only lookup function symbols, no data symbols.
Added PIC-flag to aix*-cc build targets.
The marked printf's will be removed when the test case is implemented.

# Conflicts:
#	Configurations/10-main.conf

Added DATA segment checking to catch ptrgl virtual addresses. Avoid
memleaks with every AIX/dladdr() call. Removed debug-fprintf()s.
Added test case for DSO_dsobyaddr(), which will eventually call dladdr().
Removed unecessary AIX ifdefs again.

# Conflicts:
#	test/shlibloadtest.c

Fixed indentation, moved trailing operators to leading and removed
unecessary braces. Tried to sqeeze everything in 80 cpl.
Removed extra errno declaration. Changed a void* into char* for
portable pointer arithmetics.
Addressed a Travis issue complaining about another void*-cast.
Reconfigured the test code to be empty on Windows, as the implementation
there is completely different and would always produce an error. This is
addressing the Appveyor issue.

# Conflicts:
#	test/shlibloadtest.c

Although it deviates from the actual prototype of DSO_dsobyaddr(), this
is now ISO C compliant and gcc -Wpedantic accepts the code.

# Conflicts:
#	test/shlibloadtest.c