Rename net.{c,h} to net_sockets.{c,h}

The library/net.c and its corresponding include/mbedtls/net.h file are
renamed to library/net_sockets.c and include/mbedtls/net_sockets.h
respectively. This is to avoid naming collisions in projects which also
have files with the common name 'net'.
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 6aeb385..98fe8c9 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -71,7 +71,7 @@
 
 set(src_tls
     debug.c
-    net.c
+    net_sockets.c
     ssl_cache.c
     ssl_ciphersuites.c
     ssl_cli.c
diff --git a/library/Makefile b/library/Makefile
index 00528b3..4b29628 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -68,9 +68,10 @@
 		x509_create.o	x509_crl.o	x509_crt.o	\
 		x509_csr.o	x509write_crt.o	x509write_csr.o
 
-OBJS_TLS=	debug.o		net.o		ssl_cache.o	\
-		ssl_ciphersuites.o		ssl_cli.o	\
-		ssl_cookie.o	ssl_srv.o	ssl_ticket.o	\
+OBJS_TLS=	debug.o		net_sockets.o		\
+		ssl_cache.o	ssl_ciphersuites.o	\
+		ssl_cli.o	ssl_cookie.o		\
+		ssl_srv.o	ssl_ticket.o		\
 		ssl_tls.o
 
 .SILENT:
diff --git a/library/error.c b/library/error.c
index 4bd15bf..71d4faa 100644
--- a/library/error.c
+++ b/library/error.c
@@ -102,7 +102,7 @@
 #endif
 
 #if defined(MBEDTLS_NET_C)
-#include "mbedtls/net.h"
+#include "mbedtls/net_sockets.h"
 #endif
 
 #if defined(MBEDTLS_OID_C)
diff --git a/library/net.c b/library/net_sockets.c
similarity index 99%
rename from library/net.c
rename to library/net_sockets.c
index 8b96321..cc06cbf 100644
--- a/library/net.c
+++ b/library/net_sockets.c
@@ -38,7 +38,7 @@
 #include <stdlib.h>
 #endif
 
-#include "mbedtls/net.h"
+#include "mbedtls/net_sockets.h"
 
 #include <string.h>