deprecate tempnam, tmpnam, L_tmpnam and gets

[korli]

from ​https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdio.h.html

The gets(), tmpnam(), and tempnam() functions and the L_tmpnam macro are marked obsolescent.

• definitions in stdio.h should be removed or protected with a macro.

• symbols should only be exported for older versions of Haiku (see ​https://git.haiku-os.org/haiku/tree/src/system/libroot/libroot_versions)

• release notes should be updated.

[pulkomandy]

I think we can mark them with __attribute__((deprecated)) for gcc8, that will result in a compile time warning. Is there a need for hiding them more than that?

[korli]

C11 removed gets() entirely. For this reason: "or protected with a macro".

[pulkomandy]

yes, we can use a #if on stdc_version or similar

[pulkomandy]

​https://review.haiku-os.org/c/haiku/+/2061

[waddlesplash]

First part done in hrev53682.

[X512]

Build broken after this change on x86 native Haiku build:

C++ objects/haiku/x86/release/system/libroot/os/launch.o 
In file included from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/ext/string_conversions.h:43,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/bits/basic_string.h:6400,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/string:52,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/stdexcept:39,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/array:3,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/tuple:3,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/bits/stl_map.h:63,
                 from build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/map:61,
                 from ../headers/private/app/TokenSpace.h:13,
                 from ../src/system/libroot/os/launch.cpp:9:
build_packages/gcc_x86_syslibs_devel-8.3.0_2019_05_24-7-x86_gcc2/develop/headers/x86/c++/cstdio:141:11: error: '::tmpnam' has not been declared
   using ::tmpnam;
           ^~~~~~

[pulkomandy]

• gcc_x86 needs to be rebuilt (develop/headers/x86/c++/i586-pc-haiku/bits/c++config.h defines GLIBCXX_USE_TMPNAM)
• jasper needs to be patched and rebuilt (uses L_tmpnam)

I think before doing that we need to update the haikuports builders?

[waddlesplash]

Reverted in hrev53688.