Avoid "inline" after return type in function definitions

[Joseph Myers]

On Wed, 6 Feb 2019, Florian Weimer wrote:

> Do you plan to submit patches to turn on individual -Werror= flags where
> these are reasonable (such as -Werror=old-style-declaration)?

I'm hoping it will be possible to use -Wextra with selected -Wno- options.  
(Subject to care to avoid the use of -Wno- options for 
nptl/tst-initializers1.c, which should get the full effect of -Wextra, 
without -Wno-missing-field-initializers - whereas there are over a 
thousand -Wmissing-field-initializers warnings building glibc, so I expect 
-Wno-missing-field-initializers would be needed at least initially if 
enabling -Wextra.)

The warnings I'm using for the present fixes are from a single -Wextra 
build for x86_64, of glibc but not the testsuite; actually adding new 
warning options will need build-many-glibcs.py testing to find and fix 
warnings more thoroughly.

-- 
Joseph S. Myers
joseph@codesourcery.com