support for windows 7

[sergeevabc]

Windows 7 x64, pdfcpu 0.7+

$ pdfcpu.exe
Exception 0xc0000005 0x8 0x0 0x0
PC=0x0

runtime.asmstdcall(0x22fcf8)
        /usr/local/go/src/runtime/sys_windows_amd64.s:75 +0x7a fp=0x22fc80 sp=0x22fc60 pc=0x46db1a
rax     0x0
rbx     0xe7fff8
rcx     0xf06088
rdx     0x20
rdi     0x7fffffdd000
rsi     0x22fe78
rbp     0x22fdc0
rsp     0x22fc58
r8      0x0
r9      0x22fee8
r10     0x288a2e8
r11     0xc000004000
r12     0x22fec8
r13     0x0
r14     0xe7f280
r15     0x3
rip     0x0
rflags  0x10293
cs      0x33
fs      0x53
gs      0x2b

The reason for this behavior lies in the fact that the developers of Go language betrayed Windows 7 users by removing the compilation option for this OS. So the latest working version of your program here is 0.6. Please, add a separate build that uses an earlier version of the compiler, as @schollz did with his Croc.

[hhrutter]

Hello!

Microsoft stopped Windows 7 support in 2020 and this is the reason why Win7 is not supported anymore by the Go team.
I don't see any betrayal here and I am generally moving along with this.

I'll see what I can do when it's time to cut the next release though.