iOS, patch harfbuzz

Add support for arm64

Change-Id: Icfc47b0c3b600ea3d26c40741c933028e8e9c47d

external/harfbuzz/harfbuzz-ios.patch

@@ -1,11 +1,20 @@
---- configure
-+++ configure
-@@ -19046,6 +19046,8 @@
- 
- 	else
- 		# On iOS CoreText and CoreGraphics are stand-alone frameworks
-+               # Forget the cache failure to find CTFontRef above
-+               unset ac_cv_type_CTFontRef
- 		if test "x$have_coretext" != "xtrue"; then
- 			ac_fn_c_check_type "$LINENO" "CTFontRef" "ac_cv_type_CTFontRef" "#include <CoreText/CoreText.h>
- "
+--- config.sub
++++ config.sub
+@@ -253,7 +253,7 @@
+ 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
+ 	| am33_2.0 \
+ 	| arc | arceb \
+-	| arm | arm[bl]e | arme[lb] | armv[2-8] | armv[3-8][lb] | armv7[arm] \
++	| arm | arm[bl]e | arme[lb] | armv[2-8] | armv[3-8][lb] | armv7[arm] | arm64 \
+ 	| avr | avr32 \
+ 	| be32 | be64 \
+ 	| bfin \
+@@ -367,7 +367,7 @@
+ 	| alpha-* | alphaev[4-8]-* | alphaev56-* | alphaev6[78]-* \
+ 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \
+ 	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* | arceb-* \
+-	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
++	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* | arm64-* \
+ 	| avr-* | avr32-* \
+ 	| be32-* | be64-* \
+ 	| bfin-* | bs2000-* \