cpufetch: fix x86_64-darwin build (add sysctl.c on darwin too) (#528322)

pkgs/by-name/cp/cpufetch/darwin-x86-sysctl.patch

@@ -0,0 +1,11 @@
+--- a/Makefile
++++ b/Makefile
+@@ -30,7 +30,7 @@
+ 			HEADERS += $(SRC_DIR)freq/freq.h
+ 			CFLAGS += -pthread
+ 		endif
+-		ifeq ($(os), FreeBSD)
++		ifneq (,$(filter $(os),FreeBSD Darwin))
+ 			SOURCE += $(SRC_COMMON)sysctl.c
+ 			HEADERS += $(SRC_COMMON)sysctl.h
+ 		endif

pkgs/by-name/cp/cpufetch/package.nix

@@ -20,6 +20,15 @@ stdenv.mkDerivation (finalAttrs: {
     installShellFiles
   ];
 
+  # Upstream Makefile bug: for x86 builds, sysctl.c is only added to
+  # SOURCE on FreeBSD even though cpuid.c calls get_sys_info_by_name
+  # (defined there) on darwin too. Without this the x86_64-darwin
+  # build fails to link with "Undefined symbols: _get_sys_info_by_name".
+  # Widen the conditional to cover Darwin alongside FreeBSD.
+  patches = lib.optionals stdenv.hostPlatform.isDarwin [
+    ./darwin-x86-sysctl.patch
+  ];
+
   installPhase = ''
     runHook preInstall