Support Perl 5.10

[jeff]

BuildingWinPidgin says to install Perl 5.8. The latest version on http://www.activestate.com/Products/activeperl/ is 5.10.0. Compiling Pidgin with ActivePerl? 5.10.0 installed results in this error:

                 from module.h:12,
                 from BuddyList.xs:1:
../../../../../win32-dev/perl58/CORE/win32iop.h:226:1: warning: "fileno" redefin
ed
In file included from ../../../../../win32-dev/perl58/CORE/win32.h:74,
                 from ../../../../../win32-dev/perl58/CORE/win32thread.h:4,
                 from ../../../../../win32-dev/perl58/CORE/perl.h:2055,
                 from module.h:12,
                 from BuddyList.xs:1:
C:/cygwin/home/_/win32-dev/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../includ
e/stdio.h:402:1: warning: this is the location of the previous definition
BuddyList.c: In function `boot_Purple__BuddyList':
BuddyList.c:1896: error: `PL_unitcheckav' undeclared (first use in this function
)
BuddyList.c:1896: error: (Each undeclared identifier is reported only once
BuddyList.c:1896: error: for each function it appears in.)
make[4]: *** [BuddyList.o] Error 1
make[4]: Leaving directory `/home/_/pidgin/libpurple/plugins/perl/common'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/home/_/pidgin/libpurple/plugins/perl'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/_/pidgin/libpurple/plugins'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/_/pidgin/libpurple'
make: *** [all] Error 2

Also seen here: http://www.nabble.com/Compile-time-error-when-trying-to-build-on-win32-td14475898.html

[vizzz]

Broken even on linux, on my debian lenny perl has been upgraded to 5.10 and the same error appear.

[datallah@…]

(In [a578934a35307604b6eeef4b6b4b07a17901afcb]):
Update the Perl plugin loader to work with Perl 5.10. I don't think this will break compiling with older versions (note that Perl micro versions are not binary compatible). Update the win32 build to use (and require and upgrade to Perl 5.10). Fixes #5137