same as 4.7, but retargetted to apply with eapply

forward-ported from v58.2 to v64.2

--- a/config/mh-darwin
+++ b/config/mh-darwin
@@ -6,6 +6,12 @@
 ## Copyright (c) 1999-2012 International Business Machines Corporation and
 ## others. All Rights Reserved.
 
+SO_TARGET = $(LIBDIR)/$(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX).$(SO)
+FINAL_SO_TARGET = $(LIBDIR)/$(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX).$(SO_TARGET_VERSION).$(SO)
+MIDDLE_SO_TARGET = $(LIBDIR)/$(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX).$(SO_TARGET_VERSION_MAJOR).$(SO)
+
+IS_DARWIN = yes
+
 ## Flags for position independent code
 SHAREDLIBCFLAGS = -dynamic
 SHAREDLIBCXXFLAGS = -dynamic
@@ -33,7 +39,7 @@
 ifeq ($(ENABLE_RPATH),YES)
 LD_SONAME = -Wl,-compatibility_version -Wl,$(SO_TARGET_VERSION_MAJOR) -Wl,-current_version -Wl,$(SO_TARGET_VERSION) -install_name $(libdir)/$(notdir $(MIDDLE_SO_TARGET))
 else
-LD_SONAME = -Wl,-compatibility_version -Wl,$(SO_TARGET_VERSION_MAJOR) -Wl,-current_version -Wl,$(SO_TARGET_VERSION) -install_name $(notdir $(MIDDLE_SO_TARGET)) $(PKGDATA_TRAILING_SPACE)
+LD_SONAME = -Wl,-compatibility_version -Wl,$(SO_TARGET_VERSION_MAJOR) -Wl,-current_version -Wl,$(SO_TARGET_VERSION) -install_name $(libdir)/$(notdir $(MIDDLE_SO_TARGET)) $(PKGDATA_TRAILING_SPACE)
 endif
 
 ## Compiler switch to embed a runtime search path
--- a/stubdata/Makefile.in
+++ b/stubdata/Makefile.in
@@ -34,7 +34,11 @@
 
 
 ifneq ($(ENABLE_SHARED),)
+ifeq ($(IS_DARWIN),)
 SO_TARGET = $(STUBDATA_LIBDIR)$(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX)$(STUB_SUFFIX).$(SO)
+else
+SO_TARGET = $(LIBDIR)/$(STUBDATA_LIBDIR)$(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX)$(STUB_SUFFIX).$(SO)
+endif
 ALL_SO_TARGETS = $(FINAL_SO_TARGET) $(MIDDLE_SO_TARGET) $(SO_TARGET) $(BATCH_STUB_TARGET) $(SHARED_OBJECT)
 endif
 
--- a/tools/ctestfw/Makefile.in
+++ b/tools/ctestfw/Makefile.in
@@ -33,7 +33,11 @@
 endif
 
 ifneq ($(ENABLE_SHARED),)
+ifeq ($(IS_DARWIN),)
 SO_TARGET = $(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX).$(SO)
+else
+SO_TARGET = $(LIBDIR)/$(LIBICU)$(TARGET_STUBNAME)$(ICULIBSUFFIX).$(SO)
+endif
 ALL_SO_TARGETS = $(SO_TARGET) $(MIDDLE_SO_TARGET) $(FINAL_SO_TARGET) $(SHARED_OBJECT)
 endif