disable libbacktrace for mac

Author: bilam

make2/makefile-jamalgam

@@ -10,6 +10,8 @@ ODIR=../../../../bin/$(jplatform64)
 
 ifneq (bsd,$(findstring bsd,$(jplatform64)))
 
+ifneq (darwin,$(findstring darwin,$(jplatform64)))
+
 BACKTRACE_OBJS := \
  atomic.o \
  backtrace.o \
@@ -31,6 +33,8 @@ endif
 
 endif
 
+endif
+
 # note: the slowest builds have been placed at the top, to avoid starvation in parallel builds
 # (viavx is still longer than everything else combined--should maybe be broken up into multiple tus...)
 OBJS=  \

make2/makefile-jconsole

@@ -15,6 +15,8 @@ ODIR=../../../../bin/$(jplatform64)
 
 ifneq (bsd,$(findstring bsd,$(jplatform64))) 
 
+ifneq (darwin,$(findstring darwin,$(jplatform64)))
+
 BACKTRACE_OBJS := \
  atomic.o \
  backtrace.o \
@@ -36,6 +38,8 @@ endif
 
 endif
 
+endif
+
 OBJS=  \
  jconsole.o \
  jeload.o \