Use separately built "system" OpenSSL for iOS

The configury in the bundled obsolete version of OpenSSL is just too
horrible to even bother patching up to work for cross-compiling to
iOS. There are several ways to build OpenSSL for iOS described on the
net, let's just use one of them.

configure.in

@@ -5729,12 +5729,23 @@ AC_MSG_CHECKING([which libssl to use])
 if test -n "$with_system_openssl" -o -n "$with_system_libs" && \
         test "$with_system_openssl" != "no"; then
     AC_MSG_RESULT([external])
-    # Mac OS builds should get out without extra stuff is the Mac porters'
-    # wish. And pkg-config is although Xcode ships a .pc for openssl
-    if test "$_os" = "Darwin" -o "$_os" = "NetBSD" -o "$_os" = "OpenBSD" -o \
+
+    dnl Mac OS (and BSD, apparently) builds should get out without
+    dnl extra stuff is the Mac porters' wish. And pkg-config is
+    dnl although Xcode ships a .pc for OpenSSL
+
+    dnl For iOS we don't want to even try compiling bundled (outdated
+    dnl version of) OpenSSL with its ultra-weird configury. But on the
+    dnl other hand there is no system OpenSSL either. But let's just
+    dnl build a current OpenSSL separately using some of the ways
+    dnl found on the net and pretend it is a "system" OpenSSL.
+
+    dnl In either case pass OPENSSL_CFLAGS and OPENSSL_LIBS if
+    dnl necessary in the environment.
+
+    if test "$_os" = "Darwin" -o "$_os" = "iOS" -o "$_os" = "NetBSD" -o "$_os" = "OpenBSD" -o \
             "$_os" = "DragonFly"; then
-        OPENSSL_CFLAGS=
-        OPENSSL_LIBS="-lssl -lcrypto"
+        OPENSSL_LIBS=${OPENSSL_LIBS:--lssl -lcrypto}
     else
         PKG_CHECK_MODULES( OPENSSL, openssl )
     fi

distro-configs/LibreOfficeiOS.conf

@@ -15,6 +15,7 @@
 --disable-randr
 --disable-randr-link
 --disable-systray
+--with-system-openssl
 --without-fonts
 --without-java
 --without-junit