scripts/ver_linux: add Bison and Flex to the checklist

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Alexander Kapshuk <alexander.kapshuk@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/ver_linux

@@ -32,6 +32,8 @@ BEGIN {
 	printversion("PPP", version("pppd --version"))
 	printversion("Isdn4k-utils", version("isdnctrl"))
 	printversion("Nfs-utils", version("showmount --version"))
+	printversion("Bison", version("bison --version"))
+	printversion("Flex", version("flex --version"))
 
 	while (getline <"/proc/self/maps" > 0) {
 		if (/libc.*\.so$/) {