Installer: Remove "/boot/var" directory check

The PM Haiku Installer doesn't need support installing ancient Haiku
versions.

src/apps/installer/CopyEngine.cpp

@@ -507,11 +507,6 @@ CopyEngine::_ShouldCopyEntry(const BEntry& entry, const char* name,
 	const struct stat& statInfo, int32 level) const
 {
 	if (level == 1 && S_ISDIR(statInfo.st_mode)) {
-		if (strcmp(kVarDirectoryPath, name) == 0) {
-			// old location of /boot/var
-			printf("ignoring '%s'.\n", name);
-			return false;
-		}
 		if (strcmp(kPackagesDirectoryPath, name) == 0) {
 			printf("ignoring '%s'.\n", name);
 			return false;

src/apps/installer/InstallerDefs.cpp

@@ -9,5 +9,4 @@
 
 const char* const kPackagesDirectoryPath = "_packages_";
 const char* const kSourcesDirectoryPath = "_sources_";
-const char* const kVarDirectoryPath = "var";
 const char* const kSwapFilePath = "common/var/swap";

src/apps/installer/InstallerDefs.h

@@ -8,7 +8,6 @@
 
 extern const char* const kPackagesDirectoryPath;
 extern const char* const kSourcesDirectoryPath;
-extern const char* const kVarDirectoryPath;
 extern const char* const kSwapFilePath;