security/nss: fix build on powerpc64le

LLVM's integrated assembler can't build ppc-gcm.s:
ppc-gcm.s:642:24: error: invalid memory operand
    std          31,-8(SP);

Use as from binutils on powerpc64le.

While here correct the architecture check to also check for Linux's ppc64 - similar to the OS check in the same patch.

security/nss/Makefile

@@ -11,6 +11,8 @@ COMMENT=	Libraries to support development of security-enabled applications
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+BUILD_DEPENDS=	${BUILD_DEPENDS_${ARCH}}
+BUILD_DEPENDS_powerpc64le=	as:devel/binutils
 LIB_DEPENDS=	libnspr4.so:devel/nspr \
 		libsqlite3.so:databases/sqlite3
 TEST_DEPENDS=	bash:shells/bash

security/nss/files/patch-lib-freebl-Makefile

@@ -9,16 +9,17 @@
  ifeq ($(CPU_ARCH),x86_64)
      # Lower case s on mpi_amd64_common due to make implicit rules.
      ASFILES  = arcfour-amd64-gas.s mpi_amd64_common.s
-@@ -298,11 +298,11 @@ ifdef USE_64
+@@ -298,11 +298,12 @@ ifdef USE_64
      PPC_ABI := $(shell $(CC) -dM -E - < /dev/null | awk '$$2 == "_CALL_ELF" {print $$3}')
      ifeq ($(PPC_ABI),2)
          ASFILES += sha512-p8.s
 -    ifeq ($(OS_TEST),ppc64le)
-+    ifeq ($(OS_TEST),powerpc64le)
++    ifeq (,$(filter-out powerpc64le ppc64le, $(OS_TEST)))
          DEFINES += -DPPC_GCM
          EXTRA_SRCS += chacha20poly1305-ppc.c ppc-gcm-wrap.c
          ASFILES += chacha20-ppc64le.s ppc-gcm.s
 -    endif # ppc64le
++        ASFLAGS += -fno-integrated-as
 +    endif # powerpc64le
      endif
  endif # USE_64