Watcom: Use single quote for all file/path items in wlink command

Watcom Linker use single quote if necessary for quoting target name,
libraries names and libraries search path.  Object names were already
fixed.
Merge topic 'optimize-source-file-processing'

4f1c71fd cmTarget: Add all sources traced from custom commands at once.
b1c3ae33 cmTarget: Short-circuit language computation if context independent.
Merge topic 'ExternalProject_VCS-quiet'

2dad1c14 ExternalProject: Find VCS packages quietly
Merge topic 'aix-compile'

539b6c58 Fix build on AIX failing because of access to string elements
Merge topic 'update-kwsys'

f401b925 Merge branch 'upstream-kwsys' into update-kwsys
c54be583 KWSys 2014-04-07 (8b085635)
Merge topic 'suppress-warning-in-comment'

a9fe65c3 cmSystemTools: Remove unreachable return on HP compiler
72e137ea Re-word comment on unreachable return statements
Merge topic 'install-prefix-in-interface'

783bce29 Export: Disallow exported interface includes in src/build tree (#14592).
c869984e RunCMake: Allow specifying the source dir and file to test.
Merge branch 'master' into next
Merge topic 'watcom-link-quoting' into next

cb9b1e13 Watcom: Use single quote for all file/path items in wlink command