Makfile: don't print some messages twice

src/Makefile

@@ -2,7 +2,7 @@
 #     GNU Make makefile for SRB2
 #############################################################################
 # Copyright (C) 1998-2000 by DooM Legacy Team.
-# Copyright (C) 2003-2020 by Sonic Team Junior.
+# Copyright (C) 2003-2021 by Sonic Team Junior.
 #
 # This program is free software distributed under the
 # terms of the GNU General Public License, version 2.
@@ -79,6 +79,10 @@
 #
 #############################################################################
 
+ifndef MAKE_RESTARTS
+print=$(info $(1))
+endif
+
 ALL_SYSTEMS=\
 	PANDORA\
 	LINUX64\
@@ -98,7 +102,7 @@ ALL_SYSTEMS=\
 ifeq (,$(filter $(ALL_SYSTEMS),$(.VARIABLES)))
 ifeq ($(OS),Windows_NT) # all windows are Windows_NT...
 
- $(info Detected a Windows system, compiling for 32-bit MinGW SDL2...)
+ $(call print,Detected a Windows system, compiling for 32-bit MinGW SDL2...)
 
  # go for a 32-bit sdl mingw exe by default
  MINGW=1
@@ -123,7 +127,7 @@ else # if you on the *nix
  new_system:=$(new_system)64
  endif
 
- $(info Detected $(system) ($(new_system))...)
+ $(call print,Detected $(system) ($(new_system))...)
  $(new_system)=1
 
 endif

src/Makefile.cfg

@@ -60,12 +60,14 @@ ifeq   (,$(filter GCC%,$(.VARIABLES)))
 
   # If this version is not in the list, default to the latest supported
   ifeq (,$(filter $(v),$(SUPPORTED_GCC_VERSIONS)))
-   $(info\
-		Your compiler version, GCC $(version), is not supported by the Makefile.\
-		The Makefile will assume GCC $(LATEST_GCC_VERSION).)
+	define line =
+	Your compiler version, GCC $(version), is not supported by the Makefile.
+	The Makefile will assume GCC $(LATEST_GCC_VERSION).))
+	endef
+   $(call print,$(line))
    GCC$(subst .,,$(LATEST_GCC_VERSION))=1
   else
-   $(info Detected GCC $(version) (GCC$(v)))
+   $(call print,Detected GCC $(version) (GCC$(v)))
    GCC$(v)=1
   endif
  endif