Enable BSD support in CMake

src/detection/cpu/cpu_bsd.c

@@ -0,0 +1,13 @@
+#include "cpu.h"
+
+void ffDetectCPUImpl(FFCPUResult* cpu)
+{
+    ffStrbufInit(&cpu->vendor);
+    ffStrbufInit(&cpu->name);
+    cpu->coresPhysical = 1;
+    cpu->coresLogical = 1;
+    cpu->coresOnline = 1;
+    frequencyMin = 0.0;
+    frequencyMax = 0.0;
+    temperature = FF_CPU_TEMP_UNSET;
+}

src/detection/memory/memory_bsd.c

@@ -0,0 +1,9 @@
+#include "memory.h"
+
+void ffDetectMemoryImpl(FFMemoryResult* memory)
+{
+    memory->ram.bytesTotal = 0;
+    memory->ram.bytesUsed = 0;
+    memory->swap.bytesTotal = 0;
+    memory->swap.bytesUsed = 0;
+}