util/u_process: remove util_get_process_name_may_override()

Also deprecate GALLIUM_PROCESSS_NAME in favor of MESA_PROCESS_NAME,
while maintaining existing functionality for use cases relying on
GALLIUM_PROCESSS_NAME.

GALLIUM_PROCESSS_NAME takes higher precedence over MESA_PROCESS_NAME in
the case where both are set.

Signed-off-by: Ryan Neph <ryanneph@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20779>

src/util/u_process.h

@@ -41,16 +41,6 @@ util_get_process_name(void);
 size_t
 util_get_process_exec_path(char* process_path, size_t len);
 
-/**
- * Return the name of the current process.
- * \param env_name  the environment variable name used to override
- * \param procname  returns the process name
- * \param size  size of the procname buffer
- * \return  true or false for success, failure
- */
-bool
-util_get_process_name_may_override(const char *env_name, char *procname, size_t size);
-
 /**
  * Return the command line for the calling process.  This is basically
  * the argv[] array with the arguments separated by spaces.