Revert change of NGHTTP2_VERSION_NUM, keep the parentheses around VERSION_NUM, not in the sed -e

lib/Makefile.msvc

@@ -21,7 +21,7 @@ VER_MAJOR  	:= $(word 1,$(_VERSION))
 VER_MINOR  	:= $(word 2,$(_VERSION))
 VER_MICRO   := $(word 3,$(_VERSION))
 VERSION     := $(VER_MAJOR).$(VER_MINOR).$(VER_MICRO)
-VERSION_NUM	:= 0x$(shell if [ ${VER_MAJOR} -lt 10 ] ;then echo 0;fi)$(VER_MAJOR)$(shell if [ ${VER_MINOR} -lt 10 ] ;then echo 0;fi)$(VER_MINOR)$(shell if [ ${VER_MICRO} -lt 10 ] ; then echo 0;fi)$(VER_MICRO)
+VERSION_NUM := (($(VER_MAJOR) << 16) + ($(VER_MINOR) << 8) + $(VER_MICRO))
 
 GENERATED   := 'Generated by $(realpath Makefile.MSVC)'