Fix recursive make invocations building models

Summary:
public
When building models, make was invoked explicitly with `make -j` rather
than with `$(MAKE)`.  This prevented controlling parallelism from the
top-level make invocation.

Reviewed By: akotulski

Differential Revision: D2786812

fb-gh-sync-id: 7f6d58c

infer/models/c/Makefile.in

@@ -19,7 +19,7 @@ all: $(C_MODELS_FILE)
 $(C_MODELS_FILE): $(C_MODELS_SOURCES) $(CLANG_DEPS)
 # make clean in src/ in case $(CLANG_DEPS) have changed
 	$(MAKE) -C src clean
-	$(INFER) -o out/ --models_mode --no_failures_allowed -- make -C src -j
+	$(INFER) -o out/ --models_mode --no_failures_allowed -- $(MAKE) -C src
 	touch $(C_MODELS_FILE)
 
 install: $(C_MODELS_FILE)

infer/models/cpp/Makefile.in

@@ -19,7 +19,7 @@ all: $(CPP_MODELS_FILE)
 $(CPP_MODELS_FILE): $(CPP_MODELS_SOURCES) $(CLANG_DEPS)
 # make clean in src/ in case $(CLANG_DEPS) have changed
 	$(MAKE) -C src clean
-	$(INFER) -o out/ --models_mode --no_failures_allowed -- make -C src -j
+	$(INFER) -o out/ --models_mode --no_failures_allowed -- $(MAKE) -C src
 	touch $(CPP_MODELS_FILE)
 
 install: $(CPP_MODELS_FILE)

infer/models/objc/Makefile.in

@@ -19,7 +19,7 @@ all: $(OBJC_MODELS_FILE)
 $(OBJC_MODELS_FILE): $(OBJC_MODELS_SOURCES) $(CLANG_DEPS)
 # make clean in src/ in case $(CLANG_DEPS) have changed
 	$(MAKE) -C src clean
-	$(INFER) -o out/ --models_mode --no_failures_allowed -- make -C src -j
+	$(INFER) -o out/ --models_mode --no_failures_allowed -- $(MAKE) -C src
 	touch $(OBJC_MODELS_FILE)
 
 install: $(OBJC_MODELS_FILE)