Define _BSD_SOURCE for Linux so that linuxppc's libc can find ftruncate.

netwerk/base/src/Makefile.in

@@ -82,6 +82,11 @@ FORCE_STATIC_LIB = 1
 
 include $(topsrcdir)/config/rules.mk
 
+# For fruncate
+ifeq ($(OS_ARCH),Linux)
+DEFINES += -D_BSD_SOURCE
+endif
+
 install::
 	$(INSTALL) $(JSFILES) $(DIST)/bin/components