openmvg: set target architecture to 'generic'

Otherwise the resulting binaries are specialized for the machine they're
built on (like -march=native)

pkgs/applications/science/misc/openmvg/default.nix

@@ -28,6 +28,7 @@ stdenv.mkDerivation rec {
     "-DCMAKE_CXX_FLAGS=-std=c++11"
     "-DOpenMVG_BUILD_EXAMPLES=${if enableExamples then "ON" else "OFF"}"
     "-DOpenMVG_BUILD_DOC=${if enableDocs then "ON" else "OFF"}"
+    "-DTARGET_ARCHITECTURE=generic"
   ] ++ lib.optional enableShared "-DOpenMVG_BUILD_SHARED=ON";
 
   cmakeDir = "./src";