Link perl bindings against built libraries instead of system libraries (bug #456180).

--- GraphicsMagick-1.3.19/PerlMagick/Makefile.PL.in
+++ GraphicsMagick-1.3.19/PerlMagick/Makefile.PL.in
@@ -23,7 +23,7 @@
 my $magick_BIN_DIR="$ENV{'DESTDIR'}@BIN_DIR@";
 my $magick_DEP_LIBS='@MAGICK_DEP_LIBS@';
 my $magick_PERLMAINCC='@PERLMAINCC@';
-my $magick_LIB_DIR="$ENV{'DESTDIR'}@MAGICKLIBDIR@";
+my $magick_LIB_DIR="../magick/.libs";
 
 # Compute test specification
 my $delegate_tests='t/*.t';