Let number of jobs be user-configurable

j16 is an awful lot of jobs and usually results in termination of the compiler.
The number of jobs used by make can be set using the command line argument -jN
to make, where N is the number of jobs

GNUmakefile

@@ -1,7 +1,5 @@
 .NOTPARALLEL:
 
-MAX_THREADS ?= 16
-
 PROGRAM_NAME ?= bin/vlmcsd
 CLIENT_NAME ?= bin/vlmcs
 MULTI_NAME ?= bin/vlmcsdmulti
@@ -104,30 +102,30 @@ endif
 
 .DEFAULT:
 	+@(test -d bin || mkdir bin) & (test -d lib || mkdir lib) & (test -d build || mkdir build)
-	+@$(MAKE) -j$(MAX_THREADS) -C src $@ FROM_PARENT=1 PROGRAM_NAME=$(PROGRAM_NAME) CLIENT_NAME=$(CLIENT_NAME) MULTI_NAME=$(MULTI_NAME) DLL_NAME=$(DLL_NAME) A_NAME=$(A_NAME)
+	+@$(MAKE)  -C src $@ FROM_PARENT=1 PROGRAM_NAME=$(PROGRAM_NAME) CLIENT_NAME=$(CLIENT_NAME) MULTI_NAME=$(MULTI_NAME) DLL_NAME=$(DLL_NAME) A_NAME=$(A_NAME)
 
 all:
 	+@(test -d bin || mkdir bin) & (test -d lib || mkdir lib) & (test -d build || mkdir build)
-	+@$(MAKE) -j$(MAX_THREADS) -C src $@ FROM_PARENT=1 PROGRAM_NAME=$(PROGRAM_NAME) CLIENT_NAME=$(CLIENT_NAME) MULTI_NAME=$(MULTI_NAME) DLL_NAME=$(DLL_NAME) A_NAME=$(A_NAME)
+	+@$(MAKE)  -C src $@ FROM_PARENT=1 PROGRAM_NAME=$(PROGRAM_NAME) CLIENT_NAME=$(CLIENT_NAME) MULTI_NAME=$(MULTI_NAME) DLL_NAME=$(DLL_NAME) A_NAME=$(A_NAME)
 
 clean:
-	+@$(MAKE) -j$(MAX_THREADS) -C src $@ FROM_PARENT=1 PROGRAM_NAME=$(PROGRAM_NAME) CLIENT_NAME=$(CLIENT_NAME) MULTI_NAME=$(MULTI_NAME) DLL_NAME=$(DLL_NAME) A_NAME=$(A_NAME)
-	+@$(MAKE) -j$(MAX_THREADS) -C man $@
+	+@$(MAKE)  -C src $@ FROM_PARENT=1 PROGRAM_NAME=$(PROGRAM_NAME) CLIENT_NAME=$(CLIENT_NAME) MULTI_NAME=$(MULTI_NAME) DLL_NAME=$(DLL_NAME) A_NAME=$(A_NAME)
+	+@$(MAKE)  -C man $@
 
 alldocs:
-	+@$(MAKE) -j$(MAX_THREADS) -C man $@
+	+@$(MAKE)  -C man $@
 
 dosdocs:
-	+@$(MAKE) -j$(MAX_THREADS) -C man $@
+	+@$(MAKE)  -C man $@
 
 unixdocs:
-	+@$(MAKE) -j$(MAX_THREADS) -C man $@
+	+@$(MAKE)  -C man $@
 
 htmldocs:
-	+@$(MAKE) -j$(MAX_THREADS) -C man $@
+	+@$(MAKE)  -C man $@
 
 pdfdocs:
-	+@$(MAKE) -j$(MAX_THREADS) -C man $@
+	+@$(MAKE)  -C man $@
 
 GNUmakefile: