plperl fails with perl 5.14.0

It appears from the buildfarm configure logs that member anchovy was
updated yesterday from perl 5.12.3 to 5.14.0.  It doesn't like plperl.c
anymore:

ccache cc -flto -march=amdfam10 -fstack-protector -O3 -pipe -Wall -Wmissing-prototypes -Wpointer-arith
-Wdeclaration-after-statement-Wendif-labels -Wformat-security -fno-strict-aliasing -fwrapv -g -fpic -I. -I.
-I../../../src/include-D_GNU_SOURCE -I/usr/include/libxml2  -I/usr/lib/perl5/core_perl/CORE  -c -o plperl.o plperl.c
 
plperl.c: In function 'plperl_trusted_init':
plperl.c:929:36: error: lvalue required as left operand of assignment
make[3]: *** [plperl.o] Error 1

What it's unhappy about is evidently this:
       GvCV(sv) = NULL;        /* prevent call via GV */

I think we are going to have to find a different way of doing that...
        regards, tom lane