games/openmortal: prepare for freetype2 update

- freetype2 will no longer ship freetype-config (which was a pkg-config
  wrapper) in the near future -- use pkg-config to gather the required
  flags.

PR:             251512

games/openmortal/Makefile

@@ -11,7 +11,7 @@ COMMENT=	Parody of the once popular coin-up fighting game, Mortal Kombat
 
 LIB_DEPENDS=	libfreetype.so:print/freetype2
 
-USES=		dos2unix perl5 sdl tar:bzip2
+USES=		dos2unix perl5 pkgconfig sdl tar:bzip2
 GNU_CONFIGURE=	yes
 USE_SDL=	mixer image sdl net
 DOS2UNIX_FILES=	src/gfx.cpp
@@ -19,4 +19,6 @@ DOS2UNIX_FILES=	src/gfx.cpp
 PLIST_FILES=	bin/${PORTNAME}
 PORTDATA=	*
 
+BINARY_ALIAS=	freetype-config=true
+
 .include <bsd.port.mk>

games/openmortal/files/patch-configure

@@ -0,0 +1,21 @@
+--- configure.orig	2021-08-06 13:30:20 UTC
++++ configure
+@@ -1685,13 +1685,13 @@ no_ft=""
+ if test "$FT2_CONFIG" = "no" ; then
+   no_ft=yes
+ else
+-  FT2_CFLAGS=`$FT2_CONFIG $ft_config_args --cflags`
+-  FT2_LIBS=`$FT2_CONFIG $ft_config_args --libs`
+-  ft_config_major_version=`$FT2_CONFIG $ft_config_args --version | \
++  FT2_CFLAGS=`pkg-config freetype2 --cflags`
++  FT2_LIBS=`pkg-config freetype2 --libs`
++  ft_config_major_version=`pkg-config freetype2 --modversion | \
+          sed 's/\([0-9]*\).\([0-9]*\).\([0-9]*\)/\1/'`
+-  ft_config_minor_version=`$FT2_CONFIG $ft_config_args --version | \
++  ft_config_minor_version=`pkg-config freetype2 --modversion | \
+          sed 's/\([0-9]*\).\([0-9]*\).\([0-9]*\)/\2/'`
+-  ft_config_micro_version=`$FT2_CONFIG $ft_config_args --version | \
++  ft_config_micro_version=`pkg-config freetype2 --modversion | \
+          sed 's/\([0-9]*\).\([0-9]*\).\([0-9]*\)/\3/'`
+   ft_min_major_version=`echo $min_ft_version | \
+          sed 's/\([0-9]*\).\([0-9]*\).\([0-9]*\)/\1/'`