Add -D_LARGEFILE_SOURCE -D_DARWIN_USE_64_BIT_INODE=1 to JCFLAGS

for Darwin+clang. Seems to fix the instability described in JuliaLang#1013,
and all tests except lapack pass now.

Should this be added for gcc, and in general for all platforms?

Make.inc

@@ -63,6 +63,7 @@ ifeq ($(OS), Darwin)
 # use $(sw_vers -productVersion) instead of 10.5?
 CC += -mmacosx-version-min=10.5
 CXX += -mmacosx-version-min=10.5
+JCFLAGS += -D_LARGEFILE_SOURCE -D_DARWIN_USE_64_BIT_INODE=1
 endif
 endif