Upstream MIPS 32bit-build-on-64bit patch from Debian Bug#838914

From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838914

Fixes CMake so that when building a 32-bit mips binary on a 64-bit
mips machine, the target is not set as 32-bit, which apparently
confused some tests in mroonga.

cmake/package_name.cmake

@@ -30,6 +30,10 @@ IF(NOT VERSION)
       SET(64BIT 1)
     ENDIF()
 
+    IF(NOT 64BIT AND CMAKE_SYSTEM_PROCESSOR MATCHES "^mips64")
+      SET(DEFAULT_MACHINE "mips")
+    ENDIF()
+
     IF(CMAKE_SYSTEM_NAME MATCHES "Windows")
       SET(NEED_DASH_BETWEEN_PLATFORM_AND_MACHINE 0)
       SET(DEFAULT_PLATFORM "win")