Rename initialize funtions of SRFIs to srfi_<n>.

To avoid conflictions of inits between SRFIs and others, inits in the
srfi nitro should be prefixed with srfi_. Without the convention, we may
need to use generic words such as string, vector, random, array, etc.

Moreover, there are SRFIs those subject is same (e.g. array may be used
by SRFI 25, 47, 58 and 63). Thus, we need a clear and conflict-free
naming convention.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>

contrib/40.srfi/nitro.mk

@@ -1,4 +1,6 @@
-CONTRIB_INITS += features socket
+CONTRIB_INITS += \
+	srfi_0 \
+	srfi_106
 CONTRIB_LIBS += \
 	contrib/40.srfi/srfi/0.scm\
 	contrib/40.srfi/srfi/1.scm\

contrib/40.srfi/src/0.c

@@ -1,7 +1,7 @@
 #include "picrin.h"
 
 void
-pic_init_features(pic_state *pic)
+pic_init_srfi_0(pic_state *pic)
 {
     pic_add_feature(pic, "srfi-0");
     pic_add_feature(pic, "srfi-1");

contrib/40.srfi/src/106.c

@@ -397,7 +397,7 @@ pic_socket_call_with_socket(pic_state *pic)
 }
 
 void
-pic_init_socket(pic_state *pic)
+pic_init_srfi_106(pic_state *pic)
 {
   pic_deflibrary (pic, "(srfi 106)") {
     pic_defun_(pic, "socket?", pic_socket_socket_p);