extra/cpufreqd: add -lpthread to main app

pthreads are used in the plugins so we need to link with pthread from
main app. This seems to be an uclibc "feature".

extra/cpufreqd/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=cpufreqd
 pkgver=2.3.4
-pkgrel=0
+pkgrel=1
 pkgdesc="A small daemon to adjust cpu speed (and indeed voltage)"
 url="http://sourceforge.net/projects/cpufreqd"
 license="GPL2"
@@ -17,7 +17,7 @@ build ()
 	cd "$srcdir"/$pkgname-$pkgver
 	./configure --prefix=/usr \
 		--sysconfdir=/etc
-	make || return 1
+	make LIBS=-lpthread || return 1
 	make DESTDIR="$pkgdir" install
 	install -Dm 755 ../cpufreqd.initd "$pkgdir"/etc/init.d/cpufreqd \
 		|| return 1