Bump version number

configure.ac

@@ -21,7 +21,7 @@ dnl Process this file with autoconf to produce a configure script.
 
 #We use some automake macros here,
 #but don't use automake for creating Makefile.in
-AC_INIT([gforth],[0.7.9_20200109],[https://savannah.gnu.org/bugs/?func=addbug&group=gforth])
+AC_INIT([gforth],[0.7.9_20200116],[https://savannah.gnu.org/bugs/?func=addbug&group=gforth])
 AC_PREREQ(2.54)
 AC_CONFIG_MACRO_DIR([m4])
 #snapshots have numbers major.minor.release_YYYYMMDD

unix/libc.fs

@@ -78,6 +78,8 @@ c-library libc
 	\c #include <sys/random.h>
 	c-function getrandom getrandom a n u -- n ( buffer len flag -- n )
     [THEN]
+    c-function setenv setenv s s n -- n ( name un value uv overwrie -- n )
+    c-function unsetenv unsetenv s -- n ( name u -- n )
     c-value environ environ -- a ( -- env )
 end-c-library