build: fix path to libfakeroot on macOS

Signed-off-by: Felix Fietkau <[email protected]>

rules.mk

@@ -264,7 +264,13 @@ endif
 
 BUILD_KEY=$(TOPDIR)/key-build
 
-FAKEROOT:=$(STAGING_DIR_HOST)/bin/fakeroot -l $(STAGING_DIR_HOST)/lib/libfakeroot.so -f $(STAGING_DIR_HOST)/bin/faked
+ifeq ($(HOST_OS),Darwin)
+  FAKEROOT_SO:=$(STAGING_DIR_HOST)/lib/libfakeroot.dylib
+else
+  FAKEROOT_SO:=$(STAGING_DIR_HOST)/lib/libfakeroot.so
+endif
+FAKEROOT:=$(STAGING_DIR_HOST)/bin/fakeroot -l $(FAKEROOT_SO) -f $(STAGING_DIR_HOST)/bin/faked
+
 TARGET_CC:=$(TARGET_CROSS)gcc
 TARGET_CXX:=$(TARGET_CROSS)g++
 KPATCH:=$(SCRIPT_DIR)/patch-kernel.sh