add bvi package (#656)

packages/bvi/build.sh

@@ -0,0 +1,9 @@
+TERMUX_PKG_HOMEPAGE=http://bvi.sourceforge.net/
+TERMUX_PKG_DESCRIPTION="The bvi is a display-oriented editor for binary files (hex editor), based on the vi texteditor"
+TERMUX_PKG_DEPENDS="ncurses"
+TERMUX_PKG_VERSION=1.4.0
+TERMUX_PKG_SRCURL=http://sourceforge.net/projects/bvi/files/bvi/${TERMUX_PKG_VERSION}/bvi-${TERMUX_PKG_VERSION}.src.tar.gz
+TERMUX_PKG_FOLDERNAME=bvi-${TERMUX_PKG_VERSION}
+TERMUX_PKG_BUILD_IN_SRC="yes"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="ac_cv_lib_ncursesw6_addnwstr=yes"
+TERMUX_PKG_RM_AFTER_INSTALL="share/applications share/pixmaps"

packages/bvi/fix_errno.patch

@@ -0,0 +1,30 @@
+--- src/bm_unix.c~	2013-08-25 11:59:33.000000000 -0700
++++ src/bm_unix.c	2017-01-03 23:37:36.697875250 -0800
+@@ -260,7 +260,6 @@
+ vgetc()
+ {
+     char cha;
+-    extern int errno;
+ 
+     errno = 0;
+     if (read(2, &cha, 1) <= 0) {
+--- src/bvi.c~	2014-10-07 13:09:45.000000000 -0700
++++ src/bvi.c	2017-01-03 23:37:09.469794620 -0800
+@@ -729,7 +729,6 @@
+ 	char	*arg;
+ {
+ 	off_t	val;
+-	extern int errno;
+ 	char	*poi;
+ 
+ 	errno = 0;
+--- src/comm.c~	2014-01-29 06:54:53.000000000 -0800
++++ src/comm.c	2017-01-03 23:37:18.305820838 -0800
+@@ -84,7 +84,6 @@
+ extern	char	*name;			/* actual filename */
+ extern	char	**files;		/* used for "next" and "rewind" */
+ extern	int		numfiles, curfile;
+-extern	int		errno;
+ 
+ static	char	oldbuf[CMDSZ];		/** for :!! command **/
+