Fix build: remove extra argument in extract_tickets_from_keyring() call

[andreix341]

Issue:
make CONF=Release

"make" -f nbproject/Makefile-Release.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory '/opt/tickey/tickey'
"make" -f nbproject/Makefile-Release.mk dist/Release/GNU-Linux-x86/tickey
make[2]: Entering directory '/opt/tickey/tickey'
mkdir -p build/Release/GNU-Linux-x86
rm -f "build/Release/GNU-Linux-x86/main.o.d"
gcc -c -O2 -Wall -MMD -MP -MF "build/Release/GNU-Linux-x86/main.o.d" -o build/Release/GNU-Linux-x86/main.o main.c
main.c: In function ‘main’:
main.c:69:17: error: too many arguments to function ‘extract_tickets_from_keyring’; expected 0, have 1
69 | extract_tickets_from_keyring(ccache_info);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~
main.c:19:6: note: declared here
19 | void extract_tickets_from_keyring();
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [nbproject/Makefile-Release.mk:93: build/Release/GNU-Linux-x86/main.o] Error 1
make[2]: Leaving directory '/opt/tickey/tickey'
make[1]: *** [nbproject/Makefile-Release.mk:69: .build-conf] Error 2
make[1]: Leaving directory '/opt/tickey/tickey'
make: *** [nbproject/Makefile-impl.mk:40: .build-impl] Error 2

Solution:

1. change include <bits/signum.h> with #include <signal.h>
2. remove ccache_info from extract_tickets_from_keyring(ccache_info);