Convert -j to a reasonable parallelism for kati

When running makeparallel in non-ninja mode, which is used when running
kati with USE_GOMA=true, convert -j to a reasonable parallelism value
the same way ninja does.

Bug: 34392351
Test: make -C build/make/tools/makeparallel makeparallel_test
Change-Id: I9aee4dd2a3b0f2b1c2c10087be83f7b2b06f4368
diff --git a/tools/makeparallel/Makefile b/tools/makeparallel/Makefile
index 4e12b10..82a4abf 100644
--- a/tools/makeparallel/Makefile
+++ b/tools/makeparallel/Makefile
@@ -65,8 +65,9 @@
 makeparallel_test: $(MAKEPARALLEL)
 	@EXPECTED="-j1234" $(MAKEPARALLEL_TEST) -j1234
 	@EXPECTED="-j123"  $(MAKEPARALLEL_TEST) -j123
-	@EXPECTED="-j1"    $(MAKEPARALLEL_TEST) -j1
-	@EXPECTED="-j1"    $(MAKEPARALLEL_TEST)
+	@EXPECTED=""       $(MAKEPARALLEL_TEST) -j1
+	@EXPECTED="-j$$(($$(nproc) + 2))"   $(MAKEPARALLEL_TEST) -j
+	@EXPECTED=""       $(MAKEPARALLEL_TEST)
 
 	@EXPECTED="-j1234" $(MAKEPARALLEL_NINJA_TEST) -j1234
 	@EXPECTED="-j123"  $(MAKEPARALLEL_NINJA_TEST) -j123
@@ -87,8 +88,6 @@
 	@EXPECTED="-j1234 -k0" $(MAKEPARALLEL_NINJA_TEST) -j1234 -k
 	@EXPECTED="-j1234 -k0" $(MAKEPARALLEL_NINJA_TEST) -kt -j1234
 
-	@EXPECTED="-j1"    $(MAKEPARALLEL_TEST) A=-j1234
-	@EXPECTED="-j1"    $(MAKEPARALLEL_TEST) A\ -j1234=-j1234
-	@EXPECTED="-j1234" $(MAKEPARALLEL_TEST) A\ -j1234=-j1234 -j1234
+	@EXPECTED=""       $(MAKEPARALLEL_TEST) A=-j1234
 
 	@EXPECTED="-j1234 args" ARGS="args" $(MAKEPARALLEL_TEST) -j1234