[libc] Enable bind test for riscv (#100132)

Summary:
The bind test was failing in the rv32 build bot because of how the build bot was set to run the tests: we were using shared directories between the host and qemu and the bind function was trying to create a file in this directory, thus creating it in the host machine.

The OS was returning "-1 ENXIO (No such device or address)", so we changed the rv32 buildbot to copy the binaries to qemu and dropped the shared directories feature.

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Differential Revision: https://phabricator.intern.facebook.com/D60250586

Author: mikhailramalho

libc/config/linux/riscv/entrypoints.txt

@@ -856,6 +856,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.sys.select.select
 
     # sys/socket.h entrypoints
+    libc.src.sys.socket.bind
     libc.src.sys.socket.socket
   )
 endif()