0028198: Add FPE signals enabling from CMake

CMake variable BUILD_ENABLE_FPE_SIGNAL_HANDLER was added to enable FPE signals during runtime.
Updated description of BUILD_ENABLE_FPE_SIGNAL_HANDLER_DESCR variable.

dox/dev_guides/building/cmake/cmake.md

@@ -100,6 +100,7 @@ The following table gives the full list of environment variables used at the con
 | BUILD_DOC_Overview | Boolean flag | Indicates whether OCCT overview documentation project should be created together with OCCT. It is not built together with OCCT. Checking this option leads to automatic search of Doxygen binaries. Its building calls Doxygen command to generate the documentation in HTML format |
 | BUILD_PATCH | Path | Points to the directory recognized as a "patch" for OCCT. If specified, the files from this directory take precedence over the corresponding native OCCT sources. This way you are able to introduce patches to Open CASCADE Technology not affecting the original source distribution |
 | BUILD_WITH_DEBUG | Boolean flag | Enables extended messages of many OCCT algorithms, usually printed to cout. These include messages on internal errors and special cases encountered, timing, etc. |
+| BUILD_ENABLE_FPE_SIGNAL_HANDLER | Boolean flag | Enable/Disable the floating point exceptions (FPE) during DRAW execution only. Corresponding environment variable (CSF_FPE) can be changed manually in custom.bat/sh scripts without regeneration by CMake. |
 | CMAKE_CONFIGURATION_TYPES | String | Semicolon-separated CMake configurations |
 | INSTALL_DIR | Path | Points to the installation directory. *INSTALL_DIR* is a synonym of *CMAKE_INSTALL_PREFIX*. The user can specify both *INSTALL_DIR* or *CMAKE_INSTALL_PREFIX* |
 | INSTALL_DIR_BIN | Path | Relative path to the binaries installation directory (absolute path is ${INSTALL_DIR}/${INSTALL_DIR_BIN}) |