filepath.c -> filepath.cxx

Change-Id: I24545b92d7aa0898289d0dee19f34966769702a1
memory.c -> memory.cxx

Change-Id: I87d977aabd09ff01cba0f25247dca43a2bf0dd2b
mutex.c -> mutex.cxx

Change-Id: I24ebffd1b055bdd6ad93d2f071d20480b549379f
nlsupport.c -> nlsupport.cxx

Change-Id: Ida0c3c0c521f71fd3f18a12c02cf98ac96c5b7a6
pipe.c -> pipe.cxx

Change-Id: I0c9659379e6120c0bf01b6436d3127b83ad01af1
readwrite_helper.c -> readwrite_helper.cxx

Change-Id: I6d9f43a18e13cb291cb678b6faeeed7c0ec9de1a
socket.c -> socket.cxx

(At least some glibc make FD_ISSET happen to be of type bool in C++, that's why
we explicitly cast it to bool instead of comparing != 0 to avoid
loplugin:implicitboolconversion; cf.
<https://sourceware.org/ml/libc-help/2014-11/msg00018.html> "Type of FD_ISSET
happens to be bool in C++.")

Change-Id: I6da67620067392f5866d053b074198413da814b1
system.c -> system.cxx

Change-Id: I4629a01a67dd57d5915403a89da90e98b5184503
time.c -> time.cxx

Change-Id: If0f0e40964f7dc107e14753da49df5cdc77732be
interlck.c -> interlck.cxx

Change-Id: I90ca3ddbc2e1d4b830ec6e536e36e924ee14416a
file_error_transl.h -> file_error_transl.hxx

Change-Id: Ia71097a3d0fbeb606b1f6cfb7e6edb86bd45082a
file_url.h -> file_url.hxx

Change-Id: I2494779521d56edcab41f66a7c64e7dc5a9205ad
nlsupport.h -> nlsupport.hxx

Change-Id: Iaee3f8a43cba1d4fd02b6a51d42f73c8ef9e99b7
Fold procimpl.h into process.cxx

Change-Id: I1adcaeea7a1a3f7a3634897821f15443dbc78e94
readwrite_helper.h -> readwrite_helper.hxx

Change-Id: If0d71f0660d60e3bcea4db3906ffe600e00f69f2
saltime.h -> saltime.hxx

Change-Id: I930c581525ed5b02dd8850e9781b01eed12c857f
secimpl.h -> secimpl.hxx

Change-Id: I0fb87c5658bd02e327df8fdf3e0aa79f20bbc111
sockimpl.h -> sockimpl.hxx

Change-Id: Ic11f5e0923b8b9d656b74b900f52ff154bb65971
Fold uunxapi.h into uunxapi.hxx

Change-Id: Ic16758e436da13684320e7e3bf07b80d8d8c7c5d