Provide a patched version of random123 that will work on ARM platforms (#11388)

+ The additional patch enables a non-optimized random123 code path that will
  work on ARM architectures. This solution is provided only for version 1.09 to
  allow the most current version of Random123 to function on ARM architectures.
+ A more complete, long term solution will be the addition of a native ARM
  intrinsics-based implementation of random123.  This solution is being worked
  on but it is several weeks or months away.  Once the full implementation is
  available it will be provided to the author/maintainer of Random123.

var/spack/repos/builtin/packages/random123/arm-gcc.patch

@@ -0,0 +1,13 @@
+--- a/include/Random123/features/gccfeatures.h
++++ b/include/Random123/features/gccfeatures.h
+@@ -34,8 +34,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ #define R123_GNUC_VERSION (__GNUC__*10000 + __GNUC_MINOR__*100 + __GNUC_PATCHLEVEL__)
+
+-#if !defined(__x86_64__) && !defined(__i386__) && !defined(__powerpc__)
+-#  error "This code has only been tested on x86 and powerpc platforms."
++#if !defined(__x86_64__) && !defined(__i386__) && !defined(__powerpc__) && !defined(__aarch64__)
++#  error "This code has only been tested on x86, arm, and powerpc platforms."
+ #include <including_a_nonexistent_file_will_stop_some_compilers_from_continuing_with_a_hopeless_task>
+ { /* maybe an unbalanced brace will terminate the compilation */
+  /* Feel free to try the Random123 library on other architectures by changing

var/spack/repos/builtin/packages/random123/package.py

@@ -18,6 +18,7 @@ class Random123(Package):
     version('1.09', '67ae45ff94b12acea590a6aa04ed1123')
 
     patch('ibmxl.patch', when='@1.09')
+    patch('arm-gcc.patch', when='@1.09')
 
     def install(self, spec, prefix):
         # Random123 doesn't have a build system.