virtualbox6: fix build errors with gcc 10

Fixes #4105

repos/ports/ports/virtualbox6.hash

@@ -1 +1 @@
-aac8fe9dc30f5bc1488916af29e03d62199ac4ff
+0cabc6a3f8e2884326dabeb1768916704dfdd115

repos/ports/src/virtualbox6/dummies.cc

@@ -210,6 +210,7 @@ RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb) STOP
 
 /* HostDnsServiceResolvConf.cpp */
 
+#include <string>
 #include "HostDnsService.h"
 
 HostDnsServiceResolvConf::~HostDnsServiceResolvConf() { }

repos/ports/src/virtualbox6/nem.cc

@@ -472,9 +472,9 @@ void nemHCNativeNotifyPhysPageProtChanged(PVMCC pVM, RTGCPHYS GCPhys, RTHCPHYS H
                                           ::uint8_t *pu2State)
 {
 	Sup::Nem::Protection const prot {
-		.readable   = fPageProt & NEM_PAGE_PROT_READ,
-		.writeable  = fPageProt & NEM_PAGE_PROT_WRITE,
-		.executable = fPageProt & NEM_PAGE_PROT_EXECUTE,
+		.readable   = (fPageProt & NEM_PAGE_PROT_READ) != 0,
+		.writeable  = (fPageProt & NEM_PAGE_PROT_WRITE) != 0,
+		.executable = (fPageProt & NEM_PAGE_PROT_EXECUTE) != 0,
 	};
 
 	/*

repos/ports/src/virtualbox6/patches/narrowing.patch

@@ -0,0 +1,15 @@
+Fix 'narrowing conversion' error
+
+diff --git a/src/virtualbox6/src/VBox/Main/src-client/ConsoleImpl2.cpp b/src/virtualbox6/src/VBox/Main/src-client/ConsoleImpl2.cpp
+index 3693927..6975ed2 100644
+--- a/src/virtualbox6/src/VBox/Main/src-client/ConsoleImpl2.cpp
++++ b/src/virtualbox6/src/VBox/Main/src-client/ConsoleImpl2.cpp
+@@ -5262,7 +5262,7 @@ int Console::i_configNetwork(const char *pszDevice,
+                 {
+                     switch (hrc)
+                     {
+-                        case VERR_ACCESS_DENIED:
++                        case E_ACCESSDENIED:
+                             return VMSetError(VMR3GetVM(mpUVM), VERR_HOSTIF_INIT_FAILED, RT_SRC_POS,  N_(
+                                             "Failed to open '/dev/net/tun' for read/write access. Please check the "
+                                             "permissions of that node. Either run 'chmod 0666 /dev/net/tun' or "

repos/ports/src/virtualbox6/patches/series

@@ -1,3 +1,4 @@
 serial.patch
 drvtap.patch
 qemu-xhci.patch
+narrowing.patch