Make NSS build also as 64-bit ARM code for iOS

Change-Id: I03cda6ca1886a3cfad87cc438282eeea8c2a5299

external/nss/ExternalProject_nss.mk

@@ -61,6 +61,8 @@ else # OS!=WNT
 $(call gb_ExternalProject_get_state_target,nss,build): $(call gb_ExternalProject_get_state_target,nss,configure) $(call gb_ExternalExecutable_get_dependencies,python)
 	$(call gb_ExternalProject_run,build,\
 		$(if $(filter FREEBSD LINUX MACOSX,$(OS)),$(if $(filter X86_64,$(CPUNAME)),USE_64=1)) \
+		$(if $(filter IOS,$(OS)),\
+			$(if $(filter arm64,$(CC)),USE_64=1)) \
 		$(if $(filter MACOSX,$(OS)),\
 			$(if $(filter-out POWERPC,$(CPUNAME)),MACOS_SDK_DIR=$(MACOSX_SDK_PATH)) \
 			$(if $(filter-out 1050,$(MAC_OS_X_VERSION_MIN_REQUIRED)),NSS_USE_SYSTEM_SQLITE=1)) \

external/nss/nss-ios.patch

@@ -77,6 +77,17 @@
  endif
  
  MKDEPEND_DIR    = $(CORE_DEPTH)/coreconf/mkdepend
+--- a/a/nspr/pr/include/md/_darwin.h
++++ a/a/nspr/pr/include/md/_darwin.h
+@@ -26,6 +26,8 @@
+ #define _PR_SI_ARCHITECTURE "ppc"
+ #elif defined(__arm__)
+ #define _PR_SI_ARCHITECTURE "arm"
++#elif defined(__arm64__)
++#define _PR_SI_ARCHITECTURE "arm64"
+ #else
+ #error "Unknown CPU architecture"
+ #endif
 --- a/a/nspr/pr/src/Makefile.in
 +++ a/a/nspr/pr/src/Makefile.in
 @@ -180,7 +180,7 @@