compile nim on freebsd

lib/nimbase.h

@@ -398,4 +398,6 @@ typedef int assert_numbits[sizeof(NI) == sizeof(void*) && NIM_INTBITS == sizeof(
 #  include <sys/types.h>
 #  include <types/vxWind.h>
 #  include <tool/gnu/toolMacros.h>
+#elif defined(__FreeBSD__)
+#  include <sys/types.h>
 #endif

tools/niminst/buildsh.tmpl

@@ -62,7 +62,7 @@ case $uos in
     myos="freebsd"
     CC="clang"
     LINKER="clang"
-    LINK_FLAGS="$LINK_FLAGS -ldl -lm"
+    LINK_FLAGS="$LINK_FLAGS -lm"
     ;;
   *openbsd* )
     myos="openbsd"