Revert "Fix stlink on mingw64"

[xor-gate]

Reverts #569
This breaks the build on other systems which is more correct than fixing the mingw64 build:

Issue introduced:

[ 37%] Building C object CMakeFiles/st-info.dir/src/tools/info.c.o
/var/lib/jenkins/jobs/GithubCI/jobs/stlink/workspace/src/tools/info.c: In function ‘print_data’:
/var/lib/jenkins/jobs/GithubCI/jobs/stlink/workspace/src/tools/info.c:117:9: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 2 has type ‘size_t’ [-Wformat=]
         printf("0x%x\n", sl->flash_size);
         ^
/var/lib/jenkins/jobs/GithubCI/jobs/stlink/workspace/src/tools/info.c:119:9: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 2 has type ‘size_t’ [-Wformat=]
         printf("0x%x\n", sl->sram_size);
         ^
/var/lib/jenkins/jobs/GithubCI/jobs/stlink/workspace/src/tools/info.c:121:9: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 2 has type ‘size_t’ [-Wformat=]
         printf("0x%x\n", sl->flash_pgsz);
         ^
Linking C executable st-info