clib: Fix build with old libpci on Linux

clib/clib_pci.c

@@ -33,7 +33,9 @@ uint8_t pci_mechanism = 0, pci_device_count = 0;
 static struct pci_access *pacc;
 static struct pci_dev    *pdev;
 static uint32_t           last_addr = -1;
+#    ifdef _WIN32
 static const char         win_notice[] = "NOTICE:         These are dummy configuration registers generated by libpci, as it cannot access the real ones under Windows. It does not reflect the device's actual configuration.";
+#    endif
 #endif
 
 /* Configuration functions. */
@@ -144,6 +146,7 @@ pci_init_dev(uint8_t bus, uint8_t dev, uint8_t func)
         if (!pacc->devices) {
             libpci_scan_bus(pacc);
 
+#if defined(_WIN32) && PCI_LIB_VERSION > 0x030800
             /* Generate additional configuration values not generated by
                libpci's emulated configuration space code on Windows. */
             if ((pacc->method == PCI_ACCESS_WIN32_CFGMGR32) && !pacc->backend_data) { /* backend_data is NULL if no usable raw access method was found */
@@ -180,6 +183,7 @@ pci_init_dev(uint8_t bus, uint8_t dev, uint8_t func)
                     }
                 }
             }
+#endif
         }
 
         for (pdev = pacc->devices; pdev; pdev = pdev->next) {
@@ -194,17 +198,9 @@ int
 pci_init()
 {
 #ifdef PCI_LIB_VERSION
-#    ifndef _WIN32
-    if (iopl(3)) {
-        perror("iopl");
-        goto pci_init_fail;
-    }
-#    endif
-
     pacc = pci_alloc();
     if (!pacc) {
         printf("Failed to allocate pci_access structure.\n");
-pci_init_fail:
         pci_mechanism = 0;
         return pci_mechanism;
     }