graphviz: fix regex problem when graphviz parses plugins

Fixes https://github.com/termux/termux-packages/issues/5135

packages/graphviz/build.sh

@@ -2,6 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://www.graphviz.org/
 TERMUX_PKG_DESCRIPTION="Rich set of graph drawing tools"
 TERMUX_PKG_LICENSE="EPL-2.0"
 TERMUX_PKG_VERSION=2.44.0
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://www2.graphviz.org/Packages/stable/portable_source/graphviz-$TERMUX_PKG_VERSION.tar.gz
 TERMUX_PKG_SHA256=9aabd13a8018b708ab3c822de2326c19d0a52ed59f50a6b0f9318c07e2a6d93b
 TERMUX_PKG_DEPENDS="libandroid-glob, libc++, libcairo, pango, libexpat, libltdl, librsvg, libgd, zlib"

packages/graphviz/lib-gvc-gvconfig.c.patch

@@ -0,0 +1,23 @@
+--- ../gvconfig.c.orig	2020-04-18 19:07:49.625114827 +0200
++++ ./lib/gvc/gvconfig.c	2020-04-18 19:16:04.460802577 +0200
+@@ -393,7 +393,7 @@
+     char *plugin_re_end = "$"; 
+ #else
+     /* Everyone else */
+-    char *plugin_re_beg = "\\.so\\.";
++    char *plugin_re_beg = "\\.so";
+     char *plugin_re_end= "$";
+ #endif
+ 
+@@ -417,10 +417,8 @@
+ 
+ #if defined(_WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
+     sprintf(config_re,"%s%s", plugin_re_beg, plugin_re_end);
+-#elif defined(GVPLUGIN_VERSION)
+-    sprintf(config_re,"%s%d%s", plugin_re_beg, GVPLUGIN_VERSION, plugin_re_end);
+ #else
+-    sprintf(config_re,"%s[0-9]+%s", plugin_re_beg, plugin_re_end);
++    sprintf(config_re,"%s%s", plugin_re_beg, plugin_re_end);
+ #endif
+ 
+     if (regcomp(&re, config_re, REG_EXTENDED|REG_NOSUB) != 0) {