[nrf fromtree] libc/picolibc: Remove -T /dev/null linker arguments

Now that the gcc compiler driver uses the -T flag instead of -Wl,-T, we can
remove the hack here that kept the picolibc specs file from inserting the
picolibc linker script.

Signed-off-by: Keith Packard <[email protected]>
(cherry picked from commit 4e7930b)

Author: keith-packard

lib/libc/picolibc/CMakeLists.txt

@@ -13,7 +13,7 @@ if(NOT CONFIG_PICOLIBC_USE_MODULE)
 
   zephyr_compile_options(--specs=picolibc.specs)
   zephyr_compile_definitions(_POSIX_C_SOURCE=200809)
-  zephyr_libc_link_libraries(-T/dev/null --specs=picolibc.specs c -lgcc)
+  zephyr_libc_link_libraries(--specs=picolibc.specs c -lgcc)
   if(CONFIG_PICOLIBC_IO_FLOAT)
     zephyr_compile_definitions(PICOLIBC_DOUBLE_PRINTF_SCANF)
     zephyr_link_libraries(-DPICOLIBC_DOUBLE_PRINTF_SCANF)