Inline find_program() for gcovr

# pip install git+https://github.com/gcovr/gcovr.git

###############################################################################

if(ENABLE_COVERAGE)

    find_package(GCOVR)

    find_program(GCOVR_BINARY gcovr)

    find_package_handle_standard_args(GCOVR DEFAULT_MSG GCOVR_BINARY)

    if(GCOVR_FOUND)

        get_filename_component(ABSOLUTE_LAMMPS_SOURCE_DIR ${LAMMPS_SOURCE_DIR} ABSOLUTE)

# - Find gcovr

# Find the gcovr utility

#

#  GCOVR_BINARY       - path to gcovr executable

#  GCOVR_FOUND        - True if gcovr found.

#

find_program(GCOVR_BINARY gcovr)

include(FindPackageHandleStandardArgs)

# handle the QUIETLY and REQUIRED arguments and set GCOVR_FOUND to TRUE

# if all listed variables are TRUE

find_package_handle_standard_args(GCOVR DEFAULT_MSG GCOVR_BINARY)