Use $(MAKE) instead of make

So e.g. gmake can be used and options be passed

Makefile.am

@@ -159,28 +159,28 @@ DISTCLEANFILES = STARPU-REVISION
 recheck:
 	RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -C $$i recheck || RET=1 ; \
+		$(MAKE) -C $$i recheck || RET=1 ; \
 	done ; \
 	exit $$RET
 
 showfailed:
 	@RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -s -C $$i showfailed || RET=1 ; \
+		$(MAKE) -s -C $$i showfailed || RET=1 ; \
 	done ; \
 	exit $$RET
 
 showcheck:
 	RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -C $$i showcheck || RET=1 ; \
+		$(MAKE) -C $$i showcheck || RET=1 ; \
 	done ; \
 	exit $$RET
 
 showsuite:
 	RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -C $$i showsuite || RET=1 ; \
+		$(MAKE) -C $$i showsuite || RET=1 ; \
 	done ; \
 	exit $$RET
 

socl/Makefile.am

@@ -25,6 +25,6 @@ dist_SOCL_vendors_DATA = @SOCL_VENDORS@
 recheck:
 	RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -C $$i recheck || RET=1 ; \
+		$(MAKE) -C $$i recheck || RET=1 ; \
 	done ; \
 	exit $$RET

starpufft/Makefile.am

@@ -32,6 +32,6 @@ pkgconfig_DATA = libstarpufft.pc starpufft-1.0.pc starpufft-1.1.pc starpufft-1.2
 recheck:
 	RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -C $$i recheck || RET=1 ; \
+		$(MAKE) -C $$i recheck || RET=1 ; \
 	done ; \
 	exit $$RET