[OE-core] harfbuzz: Add PACKAGECONFIG for icu

[Richard Purdie]

harfbuzz can be built without icu. We don't need harfbuzz-icu for any
default OE-Core configuration so default to icu being disabled for
performance improvements.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
diff --git a/meta/recipes-graphics/harfbuzz/harfbuzz_0.9.22.bb b/meta/recipes-graphics/harfbuzz/harfbuzz_0.9.22.bb
index e315f78..26f3f38 100644
--- a/meta/recipes-graphics/harfbuzz/harfbuzz_0.9.22.bb
+++ b/meta/recipes-graphics/harfbuzz/harfbuzz_0.9.22.bb
@@ -18,11 +18,14 @@ SRC_URI[sha256sum] = "989680807e76197418338e44f226e02f155f33031efd9aff14dbc4dc14
 
 inherit autotools pkgconfig
 
-DEPENDS = "icu glib-2.0 cairo freetype"
+DEPENDS = "glib-2.0 cairo freetype"
 
 BBCLASSEXTEND = "native"
 
-EXTRA_OECONF = "--with-glib --with-freetype --with-cairo --with-icu --without-graphite2"
+EXTRA_OECONF = "--with-glib --with-freetype --with-cairo --without-graphite2"
+
+PACKAGECONFIG = ""
+PACKAGECONFIG[icu] = "--with-icu,--without-icu,icu"
 
 PACKAGES =+ "${PN}-icu ${PN}-icu-dbg ${PN}-icu-dev"