No extra spaces in CustomCommand test (#9963)

The nightly dashboard showed that the following
platforms had difficulties dealing with "bin dir"
and/or "check command line" as directory and
file names:

  AIX
  Borland 5.5, 5.6 and 5.8
  IRIX
  NMake 6.0
  OpenBSD
  VS 7.1
  Watcom

Re-visit later, after the release, to use spaces
in the bin dir and in the target name where possible.

Tests/CMakeLists.txt

@@ -376,7 +376,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DVERSION=master -P ${CMake_SOURCE_DIR}/Utilities/
     --build-generator ${CMAKE_TEST_GENERATOR}
     --build-project CustomCommand
     --build-makeprogram ${CMAKE_TEST_MAKEPROGRAM}
-    --build-exe-dir "${CMake_BINARY_DIR}/Tests/CustomCommand/bin dir"
+    --build-exe-dir "${CMake_BINARY_DIR}/Tests/CustomCommand/bin"
     --test-command CustomCommand
     )
   LIST(APPEND TEST_BUILD_DIRS "${CMake_BINARY_DIR}/Tests/CustomCommand")

Tests/CustomCommand/CMakeLists.txt

@@ -9,12 +9,16 @@ ADD_SUBDIRECTORY(GeneratedHeader)
 #
 # Lib and exe path
 #
+IF(NOT DEFINED bin_dir)
+  SET(bin_dir "bin")
+ENDIF()
+
 SET (LIBRARY_OUTPUT_PATH
-  "${PROJECT_BINARY_DIR}/bin dir" CACHE INTERNAL
+  ${PROJECT_BINARY_DIR}/${bin_dir} CACHE INTERNAL
   "Single output directory for building all libraries.")
 
 SET (EXECUTABLE_OUTPUT_PATH
-  "${PROJECT_BINARY_DIR}/bin dir" CACHE INTERNAL
+  ${PROJECT_BINARY_DIR}/${bin_dir} CACHE INTERNAL
   "Single output directory for building all executables.")
 
 ################################################################
@@ -362,15 +366,16 @@ CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/check_command_line.c.in
                @ONLY IMMEDIATE)
 ADD_EXECUTABLE(check_command_line
   ${CMAKE_CURRENT_BINARY_DIR}/check_command_line.c)
+SET(output_name "check_command_line")
 SET_PROPERTY(TARGET check_command_line
-  PROPERTY OUTPUT_NAME "check command line")
+  PROPERTY OUTPUT_NAME ${output_name})
 # SET_TARGET_PROPERTIES(check_command_line PROPERTIES
 #   COMPILE_FLAGS -DCHECK_COMMAND_LINE_VERBOSE)
 ADD_CUSTOM_COMMAND(
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/command_line_check
   COMMAND ${CMAKE_COMMAND} -DMARK_FILE=${CMAKE_CURRENT_BINARY_DIR}/check_mark.txt
   -P ${CMAKE_CURRENT_SOURCE_DIR}/check_mark.cmake
-  COMMAND "${EXECUTABLE_OUTPUT_PATH}/${CMAKE_CFG_INTDIR}/check command line"
+  COMMAND ${EXECUTABLE_OUTPUT_PATH}/${CMAKE_CFG_INTDIR}/${output_name}
   ${CHECK_ARGS} ""
   VERBATIM
   COMMENT "Checking custom command line escapes (single'quote)"
@@ -380,7 +385,7 @@ SET_SOURCE_FILES_PROPERTIES(${CMAKE_CURRENT_BINARY_DIR}/command_line_check
 ADD_CUSTOM_TARGET(do_check_command_line ALL
   DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/command_line_check
   COMMAND ${CMAKE_COMMAND} -E echo "Checking custom target command escapes"
-  COMMAND "${EXECUTABLE_OUTPUT_PATH}/${CMAKE_CFG_INTDIR}/check command line"
+  COMMAND ${EXECUTABLE_OUTPUT_PATH}/${CMAKE_CFG_INTDIR}/${output_name}
   ${CHECK_ARGS} ""
   VERBATIM
   COMMENT "Checking custom target command line escapes ($dollar-signs$)"