Fix false-positive compiler warning #3857
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Fixes the following false-positive warning of gcc (Ubuntu 11.4.0-1ubuntu1~22.04)
11.4.0 in -m32 mode:
```
/home/even/proj/proj/src/4D_api.cpp: In function 'int cs2cs_emulation_setup(PJ*)':
/home/even/proj/proj/src/4D_api.cpp:949:64: warning: '%s' directive output between 9 and 2147483645 bytes may cause result to exceed 'INT_MAX' [-Wformat-truncation=]
949 | "break_cs2cs_recursion proj=helmert exact %s "
|
```
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Fixes the following false-positive warning of gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 in -m32 mode: