Fix win64 x64 compilation

2 problems here:
- erroneous usage of asm directives
- it was necessary to republish SqueakFFIPrims for correction of WIN64 #ifdef

platforms/Cross/plugins/IA32ABI/x64win64ia32abicc.c

@@ -223,10 +223,10 @@ thunkEntry(long long rcx, long long rdx,
 				_asm mov r8 , xmm2;
 				_asm mov r9 , xmm3;
 #elif __GNUC__
-				asm("movq %%rcx,%%xmm0");
-				asm("movq %%rdx,%%xmm1");
-				asm("movq %%r8 ,%%xmm2");
-				asm("movq %%r9 ,%%xmm3");
+				asm("movq %rcx,%xmm0");
+				asm("movq %rdx,%xmm1");
+				asm("movq %r8 ,%xmm2");
+				asm("movq %r9 ,%xmm3");
 #else
 # error need to load edx with vmcc.rvs.valleint64.high on this compiler
 #endif

src/plugins/SqueakFFIPrims/SqueakFFIPrims.c

@@ -1,5 +1,5 @@
 /* Automatically generated by
-	ThreadedFFIPlugin VMMaker.oscog-eem.1893 uuid: ed498bfa-0631-4cf2-8bfb-c49e20505d40
+	ThreadedFFIPlugin VMMaker.oscogLLP64-nice.1926 uuid: 0a431195-4bae-0e42-a1f5-5a17d010c24d
  */
 
 #if defined(__ARM_ARCH__) || defined(__arm__) || defined(__arm32__) || defined(ARM32)
@@ -17,7 +17,7 @@
 # define X64SysVFFIPlugin_exports SqueakFFIPrims_exports
 # include "X64SysVFFIPlugin.c"
 
-#elif defined(WIN64) && (!defined(WIN64) && (defined(x86_64) || defined(__amd64) || defined(__x86_64) || defined(__amd64__) || defined(__x86_64__) || defined(_M_AMD64) || defined(_M_X64)))
+#elif defined(WIN64) && (defined(x86_64) || defined(__amd64) || defined(__x86_64) || defined(__amd64__) || defined(__x86_64__) || defined(_M_AMD64) || defined(_M_X64))
 
 # define X64Win64FFIPlugin_exports SqueakFFIPrims_exports
 # include "X64Win64FFIPlugin.c"