Ports: Update flex's patches to use git patches

Ports/flex/patches/0005-Hardcode-the-m4-include-path.patch

@@ -0,0 +1,34 @@
+From 07a476646c5585444df983b14bd3041d1dae61f1 Mon Sep 17 00:00:00 2001
+From: Brian Callahan <bcallah@openbsd.org>
+Date: Thu, 23 Jan 2020 23:43:31 -0500
+Subject: [PATCH 5/6] Hardcode the m4 include path
+
+---
+ src/Makefile.in | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/Makefile.in b/src/Makefile.in
+index 1f8a305..a5dd2e2 100644
+--- a/src/Makefile.in
++++ b/src/Makefile.in
+@@ -350,7 +350,7 @@ LTLIBICONV = @LTLIBICONV@
+ LTLIBINTL = @LTLIBINTL@
+ LTLIBOBJS = @LTLIBOBJS@
+ LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
+-M4 = @M4@
++M4 = /usr/local/bin/m4
+ MAKEINFO = @MAKEINFO@
+ MANIFEST_TOOL = @MANIFEST_TOOL@
+ MKDIR_P = @MKDIR_P@
+@@ -444,7 +444,7 @@ top_builddir = @top_builddir@
+ top_srcdir = @top_srcdir@
+ AM_YFLAGS = -d
+ AM_CPPFLAGS = -DLOCALEDIR=\"$(localedir)\"
+-m4 = @M4@
++m4 = /usr/local/bin/m4
+ @ENABLE_LIBFL_TRUE@lib_LTLIBRARIES = libfl.la
+ libfl_la_SOURCES = \
+ 	libmain.c \
+-- 
+2.36.1
+