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

Author: practicalswift

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)