[m-rev.] diff: fix a build problem on Mac OS X

[Julien Fischer]

Fix a build problem on Mac OS X.

library/int.m:
    LLONG_{MIN,MAX} are the standard (C99) names for the limits
    of the long long int type; use them in preference to LONG_LONG_{MIN,MAX},
    which are a GNU C thing.

    Make the use of the above macros conditional on them actually being
    defined since we cannot guarantee that they will be defined if the
    C compiler is not in C99 mode (or something similar to it).

Julien.

diff --git a/library/int.m b/library/int.m
index d3f5a7c..2530b70 100644
--- a/library/int.m
+++ b/library/int.m
@@ -671,8 +671,10 @@ int.max_int = X :-
         Max = INT_MAX;
     } else if (sizeof(MR_Integer) == sizeof(long)) {
         Max = LONG_MAX;
+    #if defined(LLONG_MAX)
     } else if (sizeof(MR_Integer) == sizeof(long long)) {
-        Max = LONG_LONG_MAX;
+        Max = LLONG_MAX;
+    #endif
     } else {
         MR_fatal_error(""Unable to figure out max integer size"");
     }
@@ -690,8 +692,10 @@ int.min_int = X :-
         Min = INT_MIN;
     } else if (sizeof(MR_Integer) == sizeof(long)) {
         Min = LONG_MIN;
+    #if defined(LLONG_MIN)
     } else if (sizeof(MR_Integer) == sizeof(long long)) {
-        Min = LONG_LONG_MIN;
+        Min = LLONG_MIN;
+    #endif
     } else {
         MR_fatal_error(""Unable to figure out min integer size"");
     }