nss: make the global variables static

#define SLOTSIZE 13

PRFileDesc *PR_ImportTCPSocket(PRInt32 osfd);

PRLock * nss_initlock = NULL;

PRLock * nss_crllock = NULL;

struct curl_llist *nss_crl_list = NULL;

NSSInitContext * nss_context = NULL;

volatile int initialized = 0;

static PRLock *nss_initlock = NULL;

static PRLock *nss_crllock = NULL;

static struct curl_llist *nss_crl_list = NULL;

static NSSInitContext *nss_context = NULL;

static volatile int initialized = 0;

typedef struct {

  const char *name;

};

static const char* pem_library = "libnsspem.so";

SECMODModule* mod = NULL;

static SECMODModule* mod = NULL;

/* NSPR I/O layer we use to detect blocking direction during SSL handshake */

static PRDescIdentity nspr_io_identity = PR_INVALID_IO_LAYER;