[MSYS2] add boost version detection via pacman

Makefile.mingw

@@ -8,11 +8,12 @@ LDFLAGS := ${LD_DEBUG} -Wl,-Bstatic -static-libgcc -static-libstdc++
 
 # Boost libraries suffix
 BOOST_SUFFIX = -mt
+BOOST_ARCHSUFFIX = ${BOOST_SUFFIX}
 
 # Since Boost 1.69.0, libraries in mingw use suffix with architecture in x32/x64 view
-ifneq (, $(findstring x86_64, $(SYS)))
+ifneq (, $(findstring x86_64, $(SYS))$(findstring 1.69.0, $(shell pacman -Q mingw-w64-x86_64-boost)))
 	BOOST_ARCHSUFFIX = ${BOOST_SUFFIX}-x64
-else ifneq (, $(findstring i686, $(SYS)))
+else ifneq (, $(findstring i686, $(SYS))$(findstring 1.69.0, $(shell pacman -Q mingw-w64-i686-boost)))
 	BOOST_ARCHSUFFIX = ${BOOST_SUFFIX}-x32
 else
 	$(error Not supported platform)