fix nondeterministic C include renaming

[mikedh]

No description provided.

[psigen]

The normal way to do this is to just ask git and put the result into a compile variable:
https://cmake.org/pipermail/cmake/2018-October/068389.html

find_package(Git QUIET REQUIRED)

execute_process(
    COMMAND "${GIT_EXECUTABLE}" describe --always HEAD
    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
    RESULT_VARIABLE res
    OUTPUT_VARIABLE MYAPP_VERSION
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)

set_property(GLOBAL APPEND
    PROPERTY CMAKE_CONFIGURE_DEPENDS
    "${CMAKE_SOURCE_DIR}/.git/index")

string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+).*$"
"\\1;\\2;\\3" _ver_parts "${MYAPP_VERSION}")
list(GET _ver_parts 0 MYAPP_VERSION_MAJOR)
list(GET _ver_parts 1 MYAPP_VERSION_MINOR)
list(GET _ver_parts 2 MYAPP_VERSION_PATCH)

if("${MYAPP_VERSION}" MATCHES "^.*-(.*)-g.*$")
    string(REGEX REPLACE "^.*-(.*)-g.*$" "\\1" MYAPP_VERSION_MICRO
"${MYAPP_VERSION}")
else()
    set(MYAPP_VERSION_MICRO "0")
endif()

This prevents the spurious commit versions in source code.