contrib: fix restinio build with cmake < 3.8.0

Fix debian 9 + ubuntu 16.04 pipelines

Change-Id: I103cf010f53195ef9f951979b98c8c716396040b

contrib/src/restinio/cmake.patch

+ dev/restinio/CMakeLists.txt | 8 +++-----
+ 1 file changed, 3 insertions(+), 5 deletions(-)
+
+diff --git a/dev/restinio/CMakeLists.txt b/dev/restinio/CMakeLists.txt
+index df2ecdf..e5f5489 100644
+--- a/dev/restinio/CMakeLists.txt
++++ b/dev/restinio/CMakeLists.txt
+@@ -10,11 +10,9 @@ add_library(${RESTINIO} INTERFACE)
+ add_library(restinio::restinio ALIAS ${RESTINIO})
+ 
+ IF (${CMAKE_VERSION} VERSION_LESS "3.8.0")
+-	set_target_properties(${RESTINIO} PROPERTIES
+-		CXX_STANDARD 14
+-		CXX_STANDARD_REQUIRED YES
+-		CXX_EXTENSIONS NO
+-	)
++	set (CMAKE_CXX_STANDARD 14)
++	set (CMAKE_CXX_STANDARD_REQUIRED on)
++	set (CMAKE_CXX_EXTENSIONS off)
+ ELSE ()
+ 	target_compile_features(${RESTINIO} INTERFACE cxx_std_14)
+ ENDIF ()

contrib/src/restinio/rules.mak

@@ -33,6 +33,7 @@ $(TARBALLS)/restinio-$(RESTINIO_VERSION).tar.gz:
 
 restinio: restinio-$(RESTINIO_VERSION).tar.gz
 	$(UNPACK)
+	$(APPLY) $(SRC)/restinio/cmake.patch
 	$(UPDATE_AUTOCONFIG) && cd $(UNPACK_DIR)
 	$(MOVE)