feat: enable libcurl for znc-push

Before enabling libcurl in znc-push, some notifications were not
delivered,
especially messages that were sent in burst.
Working example:

```
<*push> Building notification to
api.telegram.org/botXXX/sendMessage...
<*push> Request sending
<*push> Status: 200
<*push> Message: OK
...
```

Broken example:

```
<*push> Building notification to
api.telegram.org/botXXX/sendMessage...
<*push> Request sending
...
<Notification not delivered>
```

Ref: https://github.com/amyreese/znc-push/blob/master/README.md#advanced
I subsequently enabled libcurl in push.cpp compilation and I no longer
had this problem.
I could not modify the Makefile because it is overwritten for every
module downloaded, but I could override the cpp file before building
the module.

Author: mbologna

Dockerfile

@@ -17,6 +17,7 @@ RUN \
     boost-dev\
     build-base \
     c-ares-dev \
+    curl-dev \
     cyrus-sasl-dev \
     gettext-dev \
     git \
@@ -55,6 +56,7 @@ RUN \
   tar xf \
     /tmp/znc-push.tar.gz -C \
     /tmp/znc/modules --strip-components=1 && \
+    sed -i '1i #define USE_CURL' /tmp/znc/modules/push.cpp && \
   curl -o \
     /tmp/znc-clientbuffer.tar.gz -L \
     https://github.com/CyberShadow/znc-clientbuffer/archive/master.tar.gz && \

Dockerfile.aarch64

@@ -16,6 +16,7 @@ RUN \
     boost-dev\
     build-base \
     c-ares-dev \
+    curl-dev \
     cyrus-sasl-dev \
     gettext-dev \
     git \
@@ -54,6 +55,7 @@ RUN \
   tar xf \
     /tmp/znc-push.tar.gz -C \
     /tmp/znc/modules --strip-components=1 && \
+    sed -i '1i #define USE_CURL' /tmp/znc/modules/push.cpp && \
   curl -o \
     /tmp/znc-clientbuffer.tar.gz -L \
     https://github.com/CyberShadow/znc-clientbuffer/archive/master.tar.gz && \