python,python3: Fix host Python compilation for macOS

* Remove $$$$(pkg-config --static --libs libcrypto libssl) from
  HOST_LDFLAGS

  Having this leads to an "unknown type name 'u_int'" error on Mac.
  Removing it doesn't appear to affect Python's ability to find
  buildroot LibreSSL.

* Change -Wl,-rpath=... to -Wl,-rpath,... in HOST_LDFLAGS

  The equals sign version is not supported by the Mac linker (appears to
  be an GNU extension). The comma version is supported; -rpath and its
  argument will be separated by a space when passed to the linker.

* Add ac_cv_header_libintl_h=no to HOST_CONFIGURE_VARS for Mac

  Python on Mac doesn't expect to use libintl, but if gettext-full is
  compiled for host, it will try, leading to undefined symbol errors
  during compilation. This prevents configure from finding libintl.h.

Fixes #7171.
Fixes #9621.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python/Makefile

@@ -290,13 +290,18 @@ define PyPackage/python/filespec
 endef
 
 HOST_LDFLAGS += \
-	$$$$(pkg-config --static --libs libcrypto libssl) -Wl$(comma)-rpath=$(STAGING_DIR_HOSTPKG)/lib
+	-Wl$(comma)-rpath$(comma)$(STAGING_DIR_HOSTPKG)/lib
 
 ifeq ($(HOST_OS),Linux)
 HOST_LDFLAGS += \
 	-Wl,--no-as-needed -lrt
 endif
 
+ifeq ($(HOST_OS),Darwin)
+HOST_CONFIGURE_VARS += \
+	ac_cv_header_libintl_h=no
+endif
+
 HOST_CONFIGURE_ARGS+= \
 	--without-cxx-main \
 	--without-pymalloc \