x11-fonts/fontconfig: Restore generation of font cache

Restore generation of cache prior to Meson switch
Upstream patch provided by John Hein

PR:		254963
Reported by:	Piotr Smyrak
Tested by:	Piotr Smyrak and John Hein
Approved by:	arrowd (mentor)
Obtained from:	https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/296
Differential Revision:	https://reviews.freebsd.org/D31602

x11-fonts/fontconfig/Makefile

@@ -26,6 +26,8 @@ SHEBANG_FILES=	conf.d/link_confs.py \
 		fc-lang/fc-lang.py
 
 TEST_TARGET=	test
+SUB_FILES=	pkg-install
+SUB_LIST=	PREFIX=${PREFIX}
 
 # Custom configuration variables
 FCDEFAULTFONTS=	${PREFIX}/share/fonts
@@ -33,7 +35,7 @@ FCADDFONTS=	${LOCALBASE}/lib/X11/fonts
 
 # To avoid circular dependency rebuild of docs (including manpages) needs to be
 # disabled as they depend on textproc/docbook-utils which requires fontconfig
-MESON_ARGS=	-Ddefault_library=both -Ddoc=disabled
+MESON_ARGS=	-Ddefault_library=both -Ddoc=disabled -Dfc-cache=disabled
 
 PLIST_SUB=	PREFERRED_HINTING=${PREFERRED_HINTING}
 PORTDOCS=	fontconfig-user.html fontconfig-user.pdf fontconfig-user.txt

x11-fonts/fontconfig/files/patch-fc-cache_meson.build

@@ -0,0 +1,10 @@
+--- fc-cache/meson.build.orig	2021-01-28 11:53:32 UTC
++++ fc-cache/meson.build
+@@ -8,6 +8,6 @@ fccache = executable('fc-cache', ['fc-cache.c', fcstdi
+ tools_man_pages += ['fc-cache']
+ 
+ # Do not try to execute target's fc-cache on host when cross compiling
+-if not meson.is_cross_build()
++if get_option('fc-cache').enabled() and not meson.is_cross_build()
+   meson.add_install_script(fccache, '-s', '-f', '-v')
+ endif

x11-fonts/fontconfig/files/patch-meson__options.txt

@@ -0,0 +1,8 @@
+--- meson_options.txt.orig	2020-12-03 11:45:00 UTC
++++ meson_options.txt
+@@ -11,3 +11,5 @@ option('tests', type : 'feature', value : 'auto', yiel
+   description: 'Enable unit tests')
+ option('tools', type : 'feature', value : 'auto', yield : true,
+   description: 'Build command-line tools (fc-list, fc-query, etc.)')
++option('fc-cache', type: 'feature', value : 'enabled',
++  description : 'Run fc-cache on install')