dev-libs/light: fix multiple bugs

* Add patch to fix meaning of USE udev
* Fix file collisions
* Fix fno-fcommon build issue

Closes: https://bugs.gentoo.org/673520
Closes: https://bugs.gentoo.org/709636
Closes: https://bugs.gentoo.org/739896

Reported-by: Petr Zima <zima@matfyz.cz>
Signed-off-by: Aaron Bauman <bman@gentoo.org>

dev-libs/light/Manifest

@@ -1 +1,2 @@
+DIST light-1.2.2.tar.gz 33009 BLAKE2B 6e23d7f89c1dbf412943f2b60a09f9189c5420649397a286fa964d249adb57cafb2943ef610dd13470e486d9dfb51ca40289d9974760e907f794baa27963821d SHA512 5815394fb1545d1e06234c261d475e1836e4c43e47e7707b8628891d20b70db04f1661b78ca1d236d549c734430b606498fa46de060c854791b13cf49de07b59
 DIST light-1.2.tar.gz 32592 BLAKE2B 86d2bf4a88cf61ec1b7af16510db3d26698397d5cc3ddee7f663c1f501ca6b5bf238e5f29f17142d6196908e1d444795abed41a12560c9411214d4a874c96ddb SHA512 3f876262a730ef34219e0d596065c725376218ca88a2e9f56f62a25956b9ba505168f32c5877715abf746090c053873322a3292680055cc2f5b77ec8c0d466a4

dev-libs/light/files/light-1.2.2-fcommon.patch

@@ -0,0 +1,22 @@
+--- a/src/helpers.c
++++ b/src/helpers.c
+@@ -9,6 +9,8 @@
+ #include <errno.h> // errno
+ #include <libgen.h> // dirname 
+ 
++light_loglevel_t light_loglevel;
++
+ 
+ bool light_file_read_uint64(char const *filename, uint64_t *val)
+ {
+--- a/src/helpers.h
++++ b/src/helpers.h
+@@ -21,7 +21,7 @@
+     LIGHT_NOTE_LEVEL
+ } light_loglevel_t;
+ 
+-light_loglevel_t light_loglevel;
++extern light_loglevel_t light_loglevel;
+ 
+ #define LIGHT_LOG(lvl, fp, fmt, args...)\
+     if (light_loglevel >= lvl)\

dev-libs/light/light-1.2.2.ebuild

@@ -0,0 +1,33 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit autotools eutils flag-o-matic
+
+DESCRIPTION="A program to control backlights (and other hardware lights)"
+HOMEPAGE="https://github.com/haikarainen/light"
+SRC_URI="https://github.com/haikarainen/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+IUSE="udev"
+
+RDEPEND=""
+DEPEND="udev? ( virtual/libudev:= )
+		${RDEPEND}"
+
+src_prepare() {
+	eapply "${FILESDIR}/${P}-fcommon.patch"
+	eapply_user
+	eautoreconf
+}
+
+src_configure() {
+	local myeconfargs=(
+		$(usex udev --with-udev="/lib/udev/rules.d" "")
+	)
+	econf "${myeconfargs[@]}"
+}