dev-cpp/lucene++: wire up tests

On one run (out of 6 or so), I did hit:
```
[ RUN      ] IndexWriterTest.testAddIndexesWithRollback
lucene++-tester: /usr/include/boost/smart_ptr/shared_ptr.hpp:550: typename boost::detail::sp_member_access<T>::type boost::shared_ptr<T>::operator->() const [with T = Lucene::DocumentsWriter; typename boost::detail::sp_member_access<T>::type = Lucene::DocumentsWriter*]: Assertion `px != 0' failed.
/var/tmp/portage/dev-cpp/lucene++-3.0.9/temp/environment: line 1082:    28 Aborted                    (core dumped) "$@"
```

Not sure if it's another instance of something like https://github.com/luceneplusplus/LucenePlusPlus/issues/181
or what, but not debugged further as the testsuite takes a while and had
already spent too much time on lucene++ today.

The test restriction had been there since the package was added.

Signed-off-by: Sam James <sam@gentoo.org>

dev-cpp/lucene++/files/lucene++-3.0.9-tests-gtest-cstdint.patch

@@ -0,0 +1,10 @@
+--- a/src/test/gtest/googletest/src/gtest-death-test.cc
++++ b/src/test/gtest/googletest/src/gtest-death-test.cc
+@@ -32,6 +32,7 @@
+ 
+ #include "gtest/gtest-death-test.h"
+ 
++#include <cstdint>
+ #include <utility>
+ 
+ #include "gtest/internal/gtest-port.h"

dev-cpp/lucene++/lucene++-3.0.9.ebuild

@@ -4,7 +4,7 @@
 EAPI=8
 
 MY_P="LucenePlusPlus-rel_${PV}"
-inherit cmake
+inherit edo cmake flag-o-matic
 
 DESCRIPTION="C++ port of Lucene library, a high-performance, full-featured text search engine"
 HOMEPAGE="https://github.com/luceneplusplus/LucenePlusPlus"
@@ -14,8 +14,8 @@ S="${WORKDIR}/${MY_P}"
 LICENSE="|| ( LGPL-3 Apache-2.0 )"
 SLOT="0"
 KEYWORDS="~amd64 ~hppa ~loong ~ppc ~ppc64 ~sparc ~x86"
-IUSE="debug"
-RESTRICT="test"
+IUSE="debug test"
+RESTRICT="!test? ( test )"
 
 DEPEND="dev-libs/boost:=[zlib]"
 RDEPEND="${DEPEND}"
@@ -24,13 +24,23 @@ PATCHES=(
 	"${FILESDIR}/${PN}-3.0.7-boost-1.85.patch"
 	"${FILESDIR}/${PN}-3.0.9-boost-1.87.patch"
 	"${FILESDIR}/${PN}-3.0.9-pkgconfig.patch"
+	"${FILESDIR}/${PN}-3.0.9-tests-gtest-cstdint.patch"
 )
 
 src_configure() {
+	# Can't be tested with LTO because of ODR issues in test mocks
+	filter-lto
+
 	local mycmakeargs=(
 		-DENABLE_DEMO=OFF
-		-DENABLE_TEST=OFF
+		-DENABLE_TEST=$(usex test)
 	)
 
 	cmake_src_configure
 }
+
+src_test() {
+	edo "${BUILD_DIR}"/src/test/lucene++-tester \
+		--test_dir="${S}"/src/test/testfiles \
+		--gtest_filter="-ParallelMultiSearcherTest*:SortTest.*:"
+}