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### Description

Compiling nghttp2 is failing for me in Alpine 3.21, which uses gcc 14 (14.2.0). It looks like the issue is that the header file `nghttp2.h` need to be explicitly included in the `nghttp2_mod.c` files. This is the error when running `make` inside of `src/modules/nghttp2` (after compiling kamailio as normal):

``` /home/builder/kamailio_src/src/modules/nghttp2 # make make: --libs: No such file or directory make: --libs: No such file or directory make: --libs: No such file or directory make: --libs: No such file or directory CC (gcc) [M nghttp2.so] nghttp2_mod.o nghttp2_mod.c: In function 'ksr_nghttp2_send_reply': nghttp2_mod.c:317:22: error: implicit declaration of function 'nghttp2_submit_response'; did you mean 'nghttp2_submit_response2'? [-Wimplicit-function-declaration] 317 | rv = nghttp2_submit_response(_ksr_nghttp2_ctx.session, | ^~~~~~~~~~~~~~~~~~~~~~~ | nghttp2_submit_response2 make: *** [../../Makefile.rules:100: nghttp2_mod.o] Error 1 ```

### Troubleshooting

Compilation works on Debian 12, so checked difference in `make` and `gcc` versions. Note that the `make: --libs: No such file or directory` appear to be from a different issue with `make` 4.4 not recursively expanding variables. From gcc's documentation it looks like implicit function declarations are no longer possible

https://gcc.gnu.org/gcc-14/porting_to.html

#### Reproduction

Compile Kamailio 6.0.0 (with default config), then compile the nghttp2 module

### Possible Solutions

Explicitly import `nghttp2.h` in `nghttp2_mod.c` and `nghttp2_server.c`. This is outside of my normal wheelhouse, but I was able to do this and successfully compile the module:

##### Diff for `nghttp2_mod.c`: ``` @@ -25,6 +25,7 @@ #include <stdlib.h> #include <string.h> #include <arpa/inet.h> +#include <nghttp2/nghttp2.h>

#include "../../core/sr_module.h" #include "../../core/dprint.h" ```

##### Diff for `nghttp2_server.c`: ``` @@ -23,6 +23,7 @@ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

+#include <nghttp2/nghttp2.h> #include "nghttp2_server.h"

#define OUTPUT_WOULDBLOCK_THRESHOLD (1 << 16) ```

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### Additional Information

Kamailio 6.0.0 with gcc 14.2.0

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `lsb_release -a` and `uname -a`) -->

``` /home/builder/kamailio_src/src/modules/nghttp2 # lsb_release -a No LSB modules are available. Distributor ID: Alpine Description: Alpine Linux v3.21 Release: 3.21.2 Codename: n/a

/home/builder/kamailio_src/src/modules/nghttp2 # uname -a Linux 89562285153f 5.15.167.4-microsoft-standard-WSL2 #1 SMP Tue Nov 5 00:21:55 UTC 2024 x86_64 Linux ```