Load CMAKE_USER_MAKE_RULES_OVERRIDE[_ASM] for assembler (#15108)

This is already done for C, CXX, and Fortran.
StringUuid: Implement new string(UUID) sub-command.
CTest: Add missing space in command line help.
Help: Add notes for topic 'string-uuid'
FindPostgreSQL: Fix for pg_config in multilib configurations.

Some platforms, Fedora 20 and RHEL 7 in particular, will have multiple
pg_config_${arch}.h files all included by the top level pg_config.h.
This checks all of the available pg_config*.h headers for version
information.
Merge topic 'asm-user-override-files'

487f147f Load CMAKE_USER_MAKE_RULES_OVERRIDE[_ASM] for assembler (#15108)
Merge topic 'string-uuid'

87e476e8 Help: Add notes for topic 'string-uuid'
328e8694 StringUuid: Implement new string(UUID) sub-command.
Merge topic 'fix-findpostgres-for-multilib'

741f29cc FindPostgreSQL: Fix for pg_config in multilib configurations.
Merge topic 'ctest-help-fix'

6767660f CTest: Add missing space in command line help.