refactor: compile gnu-libiconv locally

Dockerfile

@@ -1,10 +1,16 @@
+FROM alpine as iconv
+COPY ./conf/docker/iconv.sh /
+RUN sh /iconv.sh
+
 FROM alpine
 LABEL maintainer="dnomd343"
 COPY . /var/www/echoIP
-ADD ./conf/docker/init.sh /
-ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
-RUN apk --update add --no-cache nginx curl nodejs php7 php7-fpm php7-json php7-iconv php7-sqlite3 php7-openssl php7-mbstring gnu-libiconv && \
+COPY --from=iconv /tmp/iconv/ /usr/local/lib/
+RUN apk --update add --no-cache nginx curl nodejs php7 php7-fpm php7-json php7-iconv php7-sqlite3 php7-openssl php7-mbstring && \
+    rm /usr/lib/php7/modules/iconv.so && ln -s /usr/local/lib/iconv.so /usr/lib/php7/modules/ && \
+    mv /usr/local/lib/libiconv.so /usr/local/lib/libiconv.so.2 && \
     mkdir -p /run/nginx && touch /run/nginx/nginx.pid && \
+    cp /var/www/echoIP/conf/docker/init.sh / && \
     cp /var/www/echoIP/conf/docker/ip.conf /etc/nginx/echoip.conf && \
     cp -f /var/www/echoIP/conf/docker/nginx.conf /etc/nginx/nginx.conf && \
     cp /var/www/echoIP/conf/docker/init.sh / && \

conf/docker/iconv.sh

@@ -0,0 +1,22 @@
+apk add --update wget php7 php7-dev build-base autoconf re2c libtool
+mkdir -p /tmp
+
+wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz -O /tmp/libiconv.tar.gz
+tar xf /tmp/libiconv.tar.gz -C /tmp
+cd /tmp/libiconv-1.16/
+sed -i 's/_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");/#if HAVE_RAW_DECL_GETS\n_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");\n#endif/g' srclib/stdio.in.h
+./configure --prefix=/usr/local
+make && make install
+
+php_version=`php -r "phpinfo();" | grep "PHP Version" | head -1`
+php_version=${php_version#*=> }
+wget http://php.net/distributions/php-$php_version.tar.gz -O /tmp/php.tar.gz
+tar xf /tmp/php.tar.gz -C /tmp
+cd /tmp/php-$php_version/ext/iconv
+phpize
+./configure --with-iconv=/usr/local
+make && make install
+
+mkdir /tmp/iconv
+cp /usr/local/lib/libiconv.so /tmp/iconv
+cp /usr/lib/php7/modules/iconv.so /tmp/iconv