flex: revert patch dependency

Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>

package/flex/Makefile

@@ -10,7 +10,7 @@ PKG_HASH:=		2c7a412c1640e094cb058d9b2fe39d450186e09574bebb7aa28f783e3799103f
 PKG_DESCR:=		fast lexical analyzer
 PKG_SECTION:=		dev/tools
 PKG_BUILDDEP:=		m4-host
-HOST_BUILDDEP:=		m4-host autoconf-host libtool-host patch-host
+HOST_BUILDDEP:=		m4-host autoconf-host libtool-host
 PKG_URL:=		https://github.com/westes/flex
 PKG_SITES:=		https://github.com/westes/flex/releases/download/v2.6.1/
 PKG_OPTS:=		dev