sci-libs/libnova: update EAPI 7 -> 8, fix build w/ GCC-14

Closes: https://bugs.gentoo.org/886455
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

sci-libs/libnova/files/libnova-0.16.0-cflags.patch

@@ -0,0 +1,23 @@
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -1,6 +1,6 @@
+ ## Process this file with automake to produce Makefile.in
+ 
+-AM_CFLAGS = -Wall -O3 $(AVX_CFLAGS)
++AM_CFLAGS = $(AVX_CFLAGS)
+ 
+ SUBDIRS = libnova elp
+ 
+--- a/src/elp/Makefile.am
++++ b/src/elp/Makefile.am
+@@ -1,6 +1,6 @@
+ noinst_LTLIBRARIES = libelp.la
+ 
+-AM_CFLAGS = -I ../ -Wall -O3 $(AVX_CFLAGS)
++AM_CFLAGS = -I ../ $(AVX_CFLAGS)
+ 
+ libelp_la_SOURCES = \
+ 	elp1.c \
+-- 
+2.45.2
+

sci-libs/libnova/files/libnova-0.16.0-gcc14.patch

@@ -0,0 +1,24 @@
+From 1be82238860bba941b1b16c6f31763577a17b8af Mon Sep 17 00:00:00 2001
+From: Andreas Sturmlechner <asturm@gentoo.org>
+Date: Tue, 6 Aug 2024 21:49:52 +0200
+Subject: Fix build with >=GCC-14
+
+---
+ src/parallax.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/parallax.c b/src/parallax.c
+index 733e26c..0c11f04 100644
+--- a/src/parallax.c
++++ b/src/parallax.c
+@@ -17,6 +17,7 @@
+  */
+ 
+ #include <math.h>
++#include <libnova/earth.h>
+ #include <libnova/parallax.h>
+ #include <libnova/utility.h>
+ #include <libnova/sidereal_time.h>
+-- 
+2.45.2
+

sci-libs/libnova/libnova-0.16.0.ebuild

@@ -1,7 +1,7 @@
 # Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=7
+EAPI=8
 
 inherit autotools
 
@@ -16,17 +16,17 @@ IUSE="doc examples"
 
 BDEPEND="doc? ( app-text/doxygen )"
 
-PATCHES=( "${FILESDIR}"/${P}-slibtool.patch )
+PATCHES=(
+	"${FILESDIR}"/${P}-slibtool.patch
+	"${FILESDIR}"/${P}-cflags.patch
+	"${FILESDIR}"/${P}-gcc14.patch # bug 886455
+)
 
 src_prepare() {
 	default
 	eautoreconf
 }
 
-src_configure() {
-	econf --disable-static
-}
-
 src_compile() {
 	default
 	use doc && emake -C doc doc