Remove wrong 2x cpu + 1 setting. We should not overprovision taht aggressively.

Author: GHC GitLab CI

Makefile

@@ -183,7 +183,7 @@ endef
 # Handle CPUS and THREADS
 CPUS_DETECT_SCRIPT := ./mk/detect-cpu-count.sh
 CPUS := $(shell if [ -x $(CPUS_DETECT_SCRIPT) ]; then $(CPUS_DETECT_SCRIPT); else echo 2; fi)
-THREADS ?= $(shell echo $$(( 2 * $(CPUS) + 1 )))
+THREADS ?= $(shell echo $$(( $(CPUS) + 1 )))
 
 # Files that will be generated by config.status from their .in counterparts
 # FIXME: This is stupid. Why do we patch versions across multiple libraries? Idiotic.