sci-chemistry/openbabel: allow gcc-8, bug #654800

openbabel explicitly whitelists list of major GCC versions.
The change by Milan allow gcc-8. Newer upstream versions
fixed the code to handle in in a more generic way:
00120f89cf

Fixed-by: milan hodoscek
Closes: https://bugs.gentoo.org/654800
Package-Manager: Portage-2.3.36, Repoman-2.3.9

sci-chemistry/openbabel/files/openbabel-2.4.1-gcc-8.patch

@@ -0,0 +1,15 @@
+https://bugs.gentoo.org/654800
+Fixed-by: milan hodoscek
+diff --git a/../old/CMakeLists.txt b/CMakeLists.txt
+index dc38d1b..801207e 100644
+--- a/../old/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -239,7 +239,7 @@ check_type_size(clock_t CLOCK_T)
+ # Get the GCC version - from KDE4 cmake files
+ if(CMAKE_COMPILER_IS_GNUCXX)
+   exec_program(${CMAKE_C_COMPILER} ARGS --version OUTPUT_VARIABLE _gcc_version_info)
+-  string(REGEX MATCH "[34567]\\.[0-9]\\.[0-9]" _gcc_version "${_gcc_version_info}")
++  string(REGEX MATCH "[345678]\\.[0-9]\\.[0-9]" _gcc_version "${_gcc_version_info}")
+   # gcc on mac just reports: "gcc (GCC) 3.3 20030304 ..." without the
+   # patch level, handle this here:
+   if (NOT _gcc_version)

sci-chemistry/openbabel/openbabel-2.4.1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2017 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -31,6 +31,7 @@ DOCS=( AUTHORS NEWS.md README.md THANKS doc/dioxin.{inc,mol2} doc/README.{dioxin
 
 PATCHES=(
 	"${FILESDIR}"/${PN}-2.3.2-gcc-6_and_7-backport.patch
+	"${FILESDIR}"/${P}-gcc-8.patch
 	)
 
 pkg_setup() {