get home dir even when no env available on linux

libdevcore/FileSystem.cpp

@@ -27,7 +27,7 @@
 
 #if defined(_WIN32)
 #include <shlobj.h>
-#elif defined(__APPLE__)
+#else
 #include <stdlib.h>
 #include <stdio.h>
 #include <pwd.h>
@@ -56,14 +56,12 @@ std::string dev::getDataDir(std::string _prefix)
 #else
 	boost::filesystem::path dataDirPath;
 	char const* homeDir = getenv("HOME");
-#if defined(__APPLE__)
 	if (!homeDir || strlen(homeDir) == 0)
 	{
 		struct passwd* pwd = getpwuid(getuid());
 		if (pwd)
 			homeDir = pwd->pw_dir;
 	}
-#endif
 	
 	if (!homeDir || strlen(homeDir) == 0)
 		dataDirPath = boost::filesystem::path("/");