contribs: Add libjpegturbo

contribs/src/jpegturbo/SHA512SUMS

+3b7249a5f5c7b1f1fa99924ac6bc9bff3bf811815ef38505af5359d1f0edb0bfb771f0fa54308743a2d9305cb19a997453fdb00d0aade3f2f17ea917a45fde22  libjpeg-turbo-1.5.0.tar.gz
+

contribs/src/jpegturbo/rules.mak

+# jpeg
+
+JPEGTURBO_VERSION := 1.5.0
+JPEGTURBO_URL := http://downloads.sourceforge.net/project/libjpeg-turbo/$(JPEGTURBO_VERSION)/libjpeg-turbo-$(JPEGTURBO_VERSION).tar.gz
+
+$(TARBALLS)/libjpeg-turbo-$(JPEGTURBO_VERSION).tar.gz:
+	$(call download_pkg,$(JPEGTURBO_URL),jpegturbo)
+
+.sum-jpegturbo: libjpeg-turbo-$(JPEGTURBO_VERSION).tar.gz
+
+jpegturbo: libjpeg-turbo-$(JPEGTURBO_VERSION).tar.gz .sum-jpegturbo
+	$(UNPACK)
+	$(UPDATE_AUTOCONFIG)
+	$(MOVE)
+
+.jpegturbo: jpegturbo
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && $(MAKE) install
+	touch $@