Handle different installation layouts.

using  cmake option INSTALL_LAYOUT=STANDALONE would produce the layout as in 
tar.gz or zip packages.
INSTALL_LAYOUT=UNIX will produce unixish install layout  (with mysqld being in sbin subdirectory , libs in lib/mysql etc). This layout is used for RPM packages.

Subtle differences in both packages unfortunately lead to the need to recompile MySQL to use with other package type - as otherwise for example default plugins or data directories would be wrong set.

There are numerous other variables that  allow fine-tuning packaging layout. (INSTALL_BINDIR, INSTALL_LIBDIR , INSTALL_PLUGINDIR etc).

This options are different from autotools as they do not expect full paths to directories, but only subdirectory of CMAKE_INSTALL_PREFIX.

There are 2 special options that expect full directory paths
- MYSQL_DATADIR that defines default MYSQL data directory (autotools equivalent
is --localstatedir)
- SYSCONFDIR  can be added to search my.cnf search path (autotools equivalent is --sysconfdir)

cmake/mysql_add_executable.cmake

@@ -29,7 +29,7 @@ INCLUDE(cmake_parse_arguments)
 FUNCTION (MYSQL_ADD_EXECUTABLE)
   # Pass-through arguments for ADD_EXECUTABLE
   CMAKE_PARSE_ARGUMENTS(ARG
-   "WIN32;MACOSX_BUNDLE;EXCLUDE_FROM_ALL"
+   "WIN32;MACOSX_BUNDLE;EXCLUDE_FROM_ALL;DESTINATION"
    ""
    ${ARGN}
   )
@@ -41,6 +41,9 @@ FUNCTION (MYSQL_ADD_EXECUTABLE)
   ADD_EXECUTABLE(${target} ${ARG_WIN32} ${ARG_MACOSX_BUNDLE} ${ARG_EXCLUDE_FROM_ALL} ${sources})
   # tell CPack where to install
   IF(NOT ARG_EXCLUDE_FROM_ALL)
-    MYSQL_INSTALL_TARGETS(${target} DESTINATION bin)
+    IF(NOT ARG_DESTINATION)
+      SET(ARG_DESTINATION ${INSTALL_BINDIR})
+    ENDIF()
+    MYSQL_INSTALL_TARGETS(${target} DESTINATION ${ARG_DESTINATION})
   ENDIF()
 ENDFUNCTION()