File opentrack-fix-libexec-dir.patch of Package opentrack

diff -up opentrack-opentrack-2.3.12/cmake/opentrack-hier.cmake.xxxx opentrack-opentrack-2.3.12/cmake/opentrack-hier.cmake
--- opentrack-opentrack-2.3.12/cmake/opentrack-hier.cmake.xxxx	2020-08-26 20:20:41.099742566 +0200
+++ opentrack-opentrack-2.3.12/cmake/opentrack-hier.cmake	2020-08-26 20:26:16.805471471 +0200
@@ -31,7 +31,7 @@ elseif(WIN32)
     set(opentrack-debug "./debug")
     set(opentrack-install-rpath "")
 else()
-    set(opentrack-libexec "libexec/opentrack")
+    set(opentrack-libexec "lib${LIB_SUFFIX}/opentrack")
     set(opentrack-runtime-libexec "/../${opentrack-libexec}/")   # MUST HAVE A TRAILING BACKSLASH
     set(opentrack-runtime-doc "/share/doc/opentrack/")         # MUST HAVE A TRAILING BACKSLASH
     set(opentrack-bin "bin")