Fix FTBFS on Linux specific memlock code

src/tools/qstring.cpp

@@ -1075,9 +1075,11 @@ QStringData::~QStringData() {
 	if ( unicode ) {
 		delete[] ((char*)unicode);
 	}
+#if defined(Q_OS_LINUX)
 	if ( ascii && security_unpaged ) {
 		munlock(ascii, LINUX_MEMLOCK_LIMIT_BYTES);
 	}
+#endif
 	if ( ascii ) {
 		delete[] ascii;
 	}
@@ -5953,15 +5955,19 @@ const char* QString::ascii() const
 void QString::setSecurityUnPaged(bool lock) {
     if (lock != d->security_unpaged) {
 	if (d->security_unpaged) {
+#if defined(Q_OS_LINUX)
 	    if (d->ascii) {
 		munlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
 	    }
+#endif
 	    d->security_unpaged = false;
 	}
 	else {
+#if defined(Q_OS_LINUX)
 	    if (d->ascii) {
 		mlock(d->ascii, LINUX_MEMLOCK_LIMIT_BYTES);
 	    }
+#endif
 	    d->security_unpaged = true;
 	}
     }

src/widgets/qlineedit.cpp

@@ -461,7 +461,9 @@ QLineEdit::~QLineEdit()
 {
     if ((d->echoMode == NoEcho) || (d->echoMode == Password) || (d->echoMode == PasswordThreeStars)) {
 	d->text.fill(QChar(0));
+#if defined(Q_OS_LINUX)
 	munlock(d->text.d->unicode, LINUX_MEMLOCK_LIMIT_BYTES);
+#endif
     }
     delete [] d->maskData;
     delete d;