Merge pull request #75 from joshtriplett/longdouble

Fix build error on x86 without distinct long double

diff --cc src/x86/ffi64.c
index fd314242145264ade0173bb8df25123d4c26b3a1,34e395b1e3d75d49c2faddc224cbf458f8414849..5a5e04383548637939db7b2954456fdf58a199d9
--- 1/src/x86/ffi64.c
--- 2/src/x86/ffi64.c
+++ b/src/x86/ffi64.c
@@@ -207,10 -208,11 +208,11 @@@ classify_argument (ffi_type *type, enu
        classes[0] = X86_64_X87_CLASS;
        classes[1] = X86_64_X87UP_CLASS;
        return 2;
+ #endif
      case FFI_TYPE_STRUCT:
        {
 -      const int UNITS_PER_WORD = 8;
 -      int words = (type->size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
 +      const size_t UNITS_PER_WORD = 8;
 +      size_t words = (type->size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
        ffi_type **ptr;
        int i;
        enum x86_64_reg_class subclasses[MAX_CLASSES];