Clean up includes.

stepmania/PBProject/Installer/BuildInstaller.cpp

@@ -17,8 +17,8 @@ using namespace std;
 #include <cstring>
 #include <stack>
 #include <map>
-#include <sys/errno.h>
-#include <assert.h>
+#include <cerrno>
+#include <cassert>
 #include "StdString.h"
 #include "InstallerFile.h"
 #include "Processor.h"

stepmania/PBProject/Installer/Helper.mm

@@ -10,7 +10,7 @@
 #import <Security/AuthorizationTags.h>
 #import <sys/types.h>
 #import <sys/wait.h>
-#import <string.h>
+#import <cstring>
 #import <unistd.h>
 #import <fcntl.h>
 #import "Helper.h"

stepmania/PBProject/Installer/InstallerFile.cpp

@@ -13,7 +13,7 @@ using namespace std;
 #include <sys/stat.h>
 #include <sys/uio.h>
 #include <unistd.h>
-#include <assert.h>
+#include <cassert>
 #include <fcntl.h>
 #include <cstdio>
 #include "StdString.h"

stepmania/PBProject/Installer/Processor.cpp

@@ -10,7 +10,7 @@
 using namespace std;
 
 #include <sys/types.h>
-#include <sys/errno.h>
+#include <cerrno.>
 #include <sys/param.h>
 #include <sys/wait.h>
 #include <unistd.h>

stepmania/PBProject/Installer/Util.cpp

@@ -9,7 +9,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/errno.h>
+#include <cerrno>
 #include <sys/wait.h>
 #include <unistd.h>
 #include <dirent.h>