Make sure that PROFILE_* macros are defined on MinGW.  Not sure
what to put in them yet, so at the moment they are just empty.

diff -urN ocaml-3.11.0+beta1.orig/asmrun/i386.S ocaml-3.11.0+beta1.mingw/asmrun/i386.S
--- ocaml-3.11.0+beta1.orig/asmrun/i386.S	2008-08-01 09:04:57.000000000 +0100
+++ ocaml-3.11.0+beta1.mingw/asmrun/i386.S	2008-11-15 15:08:20.000000000 +0000
@@ -64,6 +64,9 @@
         popl %edx; popl %ecx; popl %eax; popl %ebp
 #define PROFILE_C \
         pushl %ebp; movl %esp, %ebp; call Lmcount$stub; popl %ebp
+#elif defined(SYS_mingw)
+#define PROFILE_CAML
+#define PROFILE_C
 #endif
 #else
 #define PROFILE_CAML