Makefile.config: set CR_PLUGIN_DEFAULT variable

By default, CRIU uses the path "/usr/lib/criu" to install and load
plugins at runtime. This path is defined by the `PLUGINDIR` variable
in Makefile.install and `CR_PLUGIN_DEFAULT` in `criu/include/plugin.h`.
However, some distribution packages might install the CRIU plugins at
"/usr/lib64/criu" instead. This patch updates the makefile to align
the path defined by `CR_PLUGIN_DEFAULT` with the value of `PLUGINDIR`.

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

Makefile.config

@@ -59,6 +59,10 @@ endif
 
 export LIBS += $(LIBS_FEATURES)
 
+ifneq ($(PLUGINDIR),)
+                FEATURE_DEFINES	+= -DCR_PLUGIN_DEFAULT="\"$(PLUGINDIR)\""
+endif
+
 CONFIG_FILE = .config
 
 $(CONFIG_FILE):

plugins/amdgpu/Makefile

@@ -15,7 +15,7 @@ DEPS_NOK 		:= ;
 __nmk_dir ?= ../../scripts/nmk/scripts/
 include $(__nmk_dir)msg.mk
 
-PLUGIN_CFLAGS  		:= -g -Wall -Werror -D _GNU_SOURCE -shared -nostartfiles -fPIC -DCR_PLUGIN_DEFAULT="$(PLUGINDIR)"
+PLUGIN_CFLAGS  		:= -g -Wall -Werror -D _GNU_SOURCE -shared -nostartfiles -fPIC
 PLUGIN_LDFLAGS		:= -lpthread -lrt -ldrm -ldrm_amdgpu
 
 ifeq ($(CONFIG_AMDGPU),y)