new package: rcshell

Requested in https://github.com/termux/termux-packages/issues/4469.

packages/rcshell/build.sh

@@ -0,0 +1,13 @@
+TERMUX_PKG_HOMEPAGE=http://tobold.org/article/rc
+TERMUX_PKG_DESCRIPTION="An alternative implementation of the plan 9 rc shell"
+TERMUX_PKG_LICENSE="ZLIB"
+TERMUX_PKG_VERSION=1.7.4
+TERMUX_PKG_SRCURL=http://static.tobold.org/rc/rc-$TERMUX_PKG_VERSION.tar.gz
+TERMUX_PKG_SHA256=5ed26334dd0c1a616248b15ad7c90ca678ae3066fa02c5ddd0e6936f9af9bfd8
+TERMUX_PKG_DEPENDS="readline"
+TERMUX_PKG_BUILD_IN_SRC=true
+
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
+ac_cv_func_setpgrp_void=yes
+rc_cv_sysv_sigcld=no
+"

packages/rcshell/rc-1.7.4_Makefile.in.patch

@@ -0,0 +1,20 @@
+diff -uNr rc-1.7.4/Makefile.in rc-1.7.4.mod/Makefile.in
+--- rc-1.7.4/Makefile.in	2015-05-14 00:26:18.000000000 +0300
++++ rc-1.7.4.mod/Makefile.in	2020-01-01 19:24:41.726859279 +0200
+@@ -438,13 +438,13 @@
+ 	@rm -f history$(EXEEXT)
+ 	$(AM_V_CCLD)$(LINK) $(history_OBJECTS) $(history_LDADD) $(LIBS)
+ 
+-mksignal$(EXEEXT): $(mksignal_OBJECTS) $(mksignal_DEPENDENCIES) $(EXTRA_mksignal_DEPENDENCIES) 
++mksignal$(EXEEXT): $(mksignal_SOURCES) $(mksignal_DEPENDENCIES) $(EXTRA_mksignal_DEPENDENCIES) 
+ 	@rm -f mksignal$(EXEEXT)
+-	$(AM_V_CCLD)$(LINK) $(mksignal_OBJECTS) $(mksignal_LDADD) $(LIBS)
++	$(AM_V_CCLD)gcc $(mksignal_SOURCES) $(mksignal_LDADD) $(LIBS) -o mksignal$(EXEEXT)
+ 
+ mkstatval$(EXEEXT): $(mkstatval_OBJECTS) $(mkstatval_DEPENDENCIES) $(EXTRA_mkstatval_DEPENDENCIES) 
+ 	@rm -f mkstatval$(EXEEXT)
+-	$(AM_V_CCLD)$(LINK) $(mkstatval_OBJECTS) $(mkstatval_LDADD) $(LIBS)
++	$(AM_V_CCLD)gcc $(mkstatval_SOURCES) $(mkstatval_LDADD) $(LIBS) -o mkstatval$(EXEEXT)
+ 
+ rc$(EXEEXT): $(rc_OBJECTS) $(rc_DEPENDENCIES) $(EXTRA_rc_DEPENDENCIES) 
+ 	@rm -f rc$(EXEEXT)

packages/rcshell/rc-1.7.4_glom.c.patch

@@ -0,0 +1,12 @@
+diff -uNr rc-1.7.4/glom.c rc-1.7.4.mod/glom.c
+--- rc-1.7.4/glom.c	2015-04-03 11:07:24.000000000 +0300
++++ rc-1.7.4.mod/glom.c	2020-01-01 19:16:28.519880748 +0200
+@@ -338,7 +338,7 @@
+ 	List *ret = nnew(List);
+ 	static int fifonumber = 0;
+ 
+-	name = nprint("/tmp/rc%d.%d", getpid(), fifonumber++);
++	name = nprint("@TERMUX_PREFIX@/tmp/rc%d.%d", getpid(), fifonumber++);
+ 	if (mkfifo(name, 0666) < 0) {
+ 		uerror("mkfifo");
+ 		return NULL;

packages/rcshell/rc-1.7.4_history.c.patch

@@ -0,0 +1,12 @@
+diff -uNr rc-1.7.4/history.c rc-1.7.4.mod/history.c
+--- rc-1.7.4/history.c	2015-04-03 11:07:24.000000000 +0300
++++ rc-1.7.4.mod/history.c	2020-01-01 19:16:57.983948748 +0200
+@@ -338,7 +338,7 @@
+ 		if (!editit)
+ 			fprintf(stderr, "%s\n", s);
+ 		if (shell == NULL)
+-			shell = "/bin/sh";
++			shell = "@TERMUX_PREFIX@/bin/sh";
+ 		execl(shell, rc_basename(shell), "-c", s, NULL);
+ 		perror(shell);
+ 		exit(1);