two small fixes

src/parallel.h

 	}
 }
 
-int coreCount() {
+inline int coreCount() {
 	return std::thread::hardware_concurrency();
 }
 

src/toolchain.cc

 	std::string objectPath = objectFilePath(srcDir, name, outDir);
 
 	// Ensure the output directory actually exists
-	sys::mkdirp(outDir);
+	sys::mkdirp(destDir);
 
 	std::vector<const char *> argv;