Remove 'inline' from a bunch of functions and leave the optimization decision to...

Remove 'inline' from a bunch of functions and leave the optimization decision to the compiler

Unbreaks the build with '-std=c89'. Previous failure:
    cc -c -pipe -fstack-protector-all -ggdb -Wshadow  -Wconversion -I/usr/local/include/  -pthread -Wall -std=c89   errlog.c -o errlog.o
    errlog.c:95:8: error: unknown type name 'inline'
    static inline void lock_logfile(void)
           ^
    errlog.c:99:8: error: unknown type name 'inline'
    static inline void unlock_logfile(void)
           ^
    errlog.c:103:8: error: unknown type name 'inline'
    static inline void lock_loginit(void)
           ^
    errlog.c:107:8: error: unknown type name 'inline'
    static inline void unlock_loginit(void)
           ^
    errlog.c:447:8: error: unknown type name 'inline'
    static inline size_t get_log_timestamp(char *buffer, size_t buffer_size)
           ^
    errlog.c:447:21: error: expected ';' after top level declarator
    static inline size_t get_log_timestamp(char *buffer, size_t buffer_size)
                        ^
                        ;