Fix linting of whitespace in pkgver

In order to detect if pkgver contains whitespace, we need to quote it.
Previously, only the characters up to the first whitespace was checked.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/libmakepkg/lint_pkgbuild/pkgver.sh.in

@@ -47,5 +47,5 @@ lint_pkgver() {
 		return 0
 	fi
 
-	check_pkgver $pkgver
+	check_pkgver "$pkgver"
 }