Disable the RPM mangling of shebangs.

The are changing the `#!/usr/bin/python3` to `#!/usr/libexec/platform-python`.
With this set, omniperf is always using the platform installed version
of python, which is python 3.6 on RHEL 8. Using virtual environments,
like conda, did not work.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>

CMakeLists.txt

@@ -401,6 +401,7 @@ set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Omniperf: tool for GPU performance profil
 set(CPACK_RPM_PACKAGE_DESCRIPTION "Omniperf is a performance analysis tool for profiling
 machine learning/HPC workloads running on AMD GPUs.")
 set(CPACK_PACKAGE_VENDOR "Advanced Micro Devices, Inc.")
+set(CPACK_PACKAGING_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX})
 
 # Package versioning
 set(CPACK_PACKAGE_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
@@ -416,6 +417,8 @@ set(CPACK_RPM_PACKAGE_PROVIDES "${CPACK_PACKAGE_NAME}")
 set(CPACK_RPM_COMPONENT_INSTALL ON)
 set(CPACK_RPM_PACKAGE_RELEASE_DIST ON)
 set(CPACK_RPM_FILE_NAME "RPM-DEFAULT")
+set(CPACK_RPM_SPEC_MORE_DEFINE "%undefine __brp_mangle_shebangs")
+
 
 if(DEFINED CPACK_PACKAGING_INSTALL_PREFIX)
     set(CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION "${CPACK_PACKAGING_INSTALL_PREFIX}")