Small patch for x86_64 compatibility

Hello, I starting to use the python plugin today. In order to build it, I had to 2 two things: 1) add -fPIC to testcpybuilder.py compile flags. (in the patch) 2) to use the plugin, I have to add a LD_PRELOAD=libpython2.7.so I don't know if that was intended, but maybe it would be nice to add a hint to the README. I'm using ubuntu oneiric ocelot 64bit. Also I got some failures in some tests: 253 successes; 4 failures; 1 skipped Failed tests: tests/plugin/gc/_gc_selftest tests/plugin/gimple-walk-tree/dump-all tests/plugin/gimple-walk-tree/exceptions tests/plugin/gimple-walk-tree/find-one make: *** [test-suite] Error 1 3 of them had the same reason, just some warnings: --- Expected stderr +++ Actual stderr @@ -0,0 +1,3 @@ +tests/plugin/gc/_gc_selftest/input.c: In function 'main': +tests/plugin/gc/_gc_selftest/input.c:41:9: warning: format '%i' expects argument of type 'int', but argument 2 has type 'char *' [-Wformat] +tests/plugin/gc/_gc_selftest/input.c:41:9: warning: format '%s' expects a matching 'char *' argument [-Wformat] 1 of them had this reason, with an actual error: --- Expected stderr +++ Actual stderr @@ -1,4 +1,6 @@ tests/plugin/gimple-walk-tree/exceptions/input.c: In function 'main': +tests/plugin/gimple-walk-tree/exceptions/input.c:41:9: warning: format '%i' expects argument of type 'int', but argument 2 has type 'char *' [-Wformat] +tests/plugin/gimple-walk-tree/exceptions/input.c:41:9: warning: format '%s' expects a matching 'char *' argument [-Wformat] tests/plugin/gimple-walk-tree/exceptions/input.c:35:1: error: Unhandled Python exception raised calling 'execute' method Traceback (most recent call last): File "tests/plugin/gimple-walk-tree/exceptions/script.py", line 30, in execute tests/plugin/gimple-walk-tree/find-one: FAIL -- Emilio Wuerges ECL - Embedded Computing Lab UFSC - Universidade Federal de Santa Catarina Brasil