Removed GenerateExportHeader warnings about old compilers

These warnings tend to flood the dashboard submissions, and it is doing
what it should (degrade gracefully with older compilers).
Merge topic 'generate-export-header-warnings' into next

1e0891e Removed GenerateExportHeader warnings about old compilers
Add missing files.
Merge topic 'fix-automoc-linker-language' into next

2a7650c Add missing files.
ExternalData: Test content link with a space in its name
Merge topic 'ExternalData-spaces' into next

183d12a ExternalData: Test content link with a space in its name
ExternalData: Test content link with a space in its name

Extend the Module.ExternalData test to cover a DATA{} reference whose
name contains a space.
Merge topic 'ExternalData-spaces' into next

cb66074 ExternalData: Test content link with a space in its name
Change the test to only use two include directories.

The shell on the MSYS platforms transforms a single include directory
to include a prefix, which is not what the test expects. As a workaround
use two directories instead of one.
Merge topic 'interface-property-external-read' into next

79cec3d Change the test to only use two include directories.
FPHSA: add argument FOUND_VAR instead of USE_ORIGINAL_CASE

In the new mode FPHSA now accepts a FOUND_VAR option, which can be
set either to ExactCase_FOUND or UPPERCASE_FOUND, no other values
are accepted.
Also add tests for that, including failure.

Alex
FPHSA: improve documentation

Alex
Merge topic 'FPHSA_FOUND_VAR_OPTION' into next

fedcd8d FPHSA: improve documentation
ebbf9b6 FPHSA: add argument FOUND_VAR instead of USE_ORIGINAL_CASE