define XS_VERSION

[skaji]

Fix #192

In old perls such as 5.8.8, it seems that we should set XS_VERSION to build src/xslate_methods.c:

[root@419bfe767e97 p5-Text-Xslate]# gcc -Isrc -I/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE -fPIC -Wall -Wextra -Wdeclaration-after-statement -c -D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -E src/xslate_methods.c | grep Text::Xslate::Methods::_guts
    SV *my_cxt_sv = *Perl_hv_fetch(my_perl, (*Perl_Imodglobal_ptr(my_perl)),"Text::Xslate::Methods::_guts" XS_VERSION,sizeof("Text::Xslate::Methods::_guts" XS_VERSION)-1,(1)); my_cxt_t *my_cxtp = (my_cxt_t*)((((my_cxt_sv)->sv_flags & 0x00010000) ? ((XPVUV*) (my_cxt_sv)->sv_any)->xuv_uv : Perl_sv_2uv_flags(my_perl, my_cxt_sv,2)));
        SV *my_cxt_sv = *Perl_hv_fetch(my_perl, (*Perl_Imodglobal_ptr(my_perl)),"Text::Xslate::Methods::_guts" XS_VERSION,sizeof("Text::Xslate::Methods::_guts" XS_VERSION)-1,(1)); my_cxt_t *my_cxtp = (my_cxt_t*)((((my_cxt_sv)->sv_flags & 0x00010000) ? ((XPVUV*) (my_cxt_sv)->sv_any)->xuv_uv : Perl_sv_2uv_flags(my_perl, my_cxt_sv,2)));
    SV *my_cxt_sv = *Perl_hv_fetch(my_perl, (*Perl_Imodglobal_ptr(my_perl)),"Text::Xslate::Methods::_guts" XS_VERSION,sizeof("Text::Xslate::Methods::_guts" XS_VERSION)-1,(1)); my_cxt_t *my_cxtp = (my_cxt_t*)((((my_cxt_sv)->sv_flags & 0x00010000) ? ((XPVUV*) (my_cxt_sv)->sv_any)->xuv_uv : Perl_sv_2uv_flags(my_perl, my_cxt_sv,2)));
    SV *my_cxt_sv = *Perl_hv_fetch(my_perl, (*Perl_Imodglobal_ptr(my_perl)),"Text::Xslate::Methods::_guts" XS_VERSION,sizeof("Text::Xslate::Methods::_guts" XS_VERSION)-1,(1)); my_cxt_t *my_cxtp = (my_cxt_t*)((XPV*) (Perl_newSV(my_perl, sizeof(my_cxt_t)-1))->sv_any)->xpv_pv; ((void)(sizeof(my_cxt_t) > 1 && (1) > ((size_t)~0)/sizeof(my_cxt_t) && (Perl_croak_nocontext(PL_memory_wrap),0)), (void)((__builtin_object_size ((char*)(my_cxtp), 0) != (size_t) -1) ? __builtin___memcpy_chk ((char*)(my_cxtp), (const char*)((my_cxt_t*)((((my_cxt_sv)->sv_flags & 0x00010000) ? ((XPVUV*) (my_cxt_sv)->sv_any)->xuv_uv : Perl_sv_2uv_flags(my_perl, my_cxt_sv,2)))), (1) * sizeof(my_cxt_t), __builtin_object_size ((char*)(my_cxtp), 0)) : __memcpy_ichk ((char*)(my_cxtp), (const char*)((my_cxt_t*)((((my_cxt_sv)->sv_flags & 0x00010000) ? ((XPVUV*) (my_cxt_sv)->sv_any)->xuv_uv : Perl_sv_2uv_flags(my_perl, my_cxt_sv,2)))), (1) * sizeof(my_cxt_t)))); Perl_sv_setuv(my_perl, my_cxt_sv,(UV)(my_cxtp));
    SV *my_cxt_sv = *Perl_hv_fetch(my_perl, (*Perl_Imodglobal_ptr(my_perl)),"Text::Xslate::Methods::_guts" XS_VERSION,sizeof("Text::Xslate::Methods::_guts" XS_VERSION)-1,(1)); my_cxt_t *my_cxtp = (my_cxt_t*)((XPV*) (Perl_newSV(my_perl, sizeof(my_cxt_t)-1))->sv_any)->xpv_pv; ((void)(sizeof(my_cxt_t) > 1 && (1) > ((size_t)~0)/sizeof(my_cxt_t) && (Perl_croak_nocontext(PL_memory_wrap),0)), (void)(__builtin_constant_p ((1) * sizeof(my_cxt_t)) && ((1) * sizeof(my_cxt_t)) == 0 ? (__warn_memset_zero_len (), (void) (0), (void) ((1) * sizeof(my_cxt_t)), (void *) ((char*)(my_cxtp))) : ((__builtin_object_size ((char*)(my_cxtp), 0) != (size_t) -1) ? __builtin___memset_chk ((char*)(my_cxtp), 0, (1) * sizeof(my_cxt_t), __builtin_object_size ((char*)(my_cxtp), 0)) : __memset_ichk ((char*)(my_cxtp), 0, (1) * sizeof(my_cxt_t))))); Perl_sv_setuv(my_perl, my_cxt_sv,(UV)(my_cxtp));

This PR will fix it.