Merge #13355: Fix "gmake check" under OpenBSD 6.3 (probably *BSD): Avoid using GNU grep specific regexp handling

db56755 Fix "gmake check" under OpenBSD 6.3 (probably *BSD): Avoid using GNU grep specific regexp handling (practicalswift)

Pull request description:

  Fixes #13337 (!)

  GNU grep and BSD grep differs in the way they handle regexps when extended regular expressions are not enabled via the `-E` flag:

  ```
  $ grep --version | head -1
  grep (GNU grep) 3.1
  $ echo "BOOST_FIXTURE_TEST_SUITE(foo)" | grep "BOOST_FIXTURE_TEST_SUITE(\|BOOST_AUTO_TEST_SUITE("
  BOOST_FIXTURE_TEST_SUITE(foo)
  $
  ```

  ```
  $ grep --version | head -1
  grep version 0.9
  $ echo "BOOST_FIXTURE_TEST_SUITE(foo)" | grep "BOOST_FIXTURE_TEST_SUITE(\|BOOST_AUTO_TEST_SUITE("
  $
  ```

  The portable way to do it is:

  ```
  $ echo "BOOST_FIXTURE_TEST_SUITE(foo)" | grep -E "(BOOST_FIXTURE_TEST_SUITE\\(|BOOST_AUTO_TEST_SUITE\\()"
  BOOST_FIXTURE_TEST_SUITE(foo)
  $
  ```

Tree-SHA512: d83c78f34421504dd8efc3921c98527f499045b702bd34715a5bc78e04ef2a5f49f601a55ad08632e870f137b1edada94a3f530291bc9107d8d6b16fe11e640b

Author: laanwj

src/Makefile.test.include

@@ -166,8 +166,8 @@ if EMBEDDED_UNIVALUE
 endif
 
 %.cpp.test: %.cpp
-	@echo Running tests: `cat $< | grep "BOOST_FIXTURE_TEST_SUITE(\|BOOST_AUTO_TEST_SUITE(" | cut -d '(' -f 2 | cut -d ',' -f 1 | cut -d ')' -f 1` from $<
-	$(AM_V_at)$(TEST_BINARY) -l test_suite -t "`cat $< | grep "BOOST_FIXTURE_TEST_SUITE(\|BOOST_AUTO_TEST_SUITE(" | cut -d '(' -f 2 | cut -d ',' -f 1 | cut -d ')' -f 1`" > $<.log 2>&1 || (cat $<.log && false)
+	@echo Running tests: `cat $< | grep -E "(BOOST_FIXTURE_TEST_SUITE\\(|BOOST_AUTO_TEST_SUITE\\()" | cut -d '(' -f 2 | cut -d ',' -f 1 | cut -d ')' -f 1` from $<
+	$(AM_V_at)$(TEST_BINARY) -l test_suite -t "`cat $< | grep -E "(BOOST_FIXTURE_TEST_SUITE\\(|BOOST_AUTO_TEST_SUITE\\()" | cut -d '(' -f 2 | cut -d ',' -f 1 | cut -d ')' -f 1`" > $<.log 2>&1 || (cat $<.log && false)
 
 %.json.h: %.json
 	@$(MKDIR_P) $(@D)