Fix minja segfaulting in cosmo build

[aittalam]

Closes: #857
(see description there)

How to replicate the issue:

• build the example code:

.cosmocc/4.0.2/bin/make o//tests/minja/test_comment_parsing
.cosmocc/4.0.2/bin/make o/tests/minja/test_comment_parsing_native

• run the compiled executables:

# both should work on e.g. mac, while the cosmo build breaks on linux
./o/tests/minja/test_comment_parsing
./o/tests/minja/test_comment_parsing_native

How to test the fix:

> .cosmocc/4.0.2/bin/make check
...
.cosmocc/4.0.2/bin/cosmoc++ -frtti -std=gnu++23 -isystem llama.cpp/vendor -std=c++17 -c -o o//tests/minja/minja_integration_test.o tests/minja/minja_integration_test.cpp
.cosmocc/4.0.2/bin/cosmoc++  -o o//tests/minja/minja_integration_test o//tests/minja/minja_integration_test.o
o//tests/minja/minja_integration_test
Running minja integration tests (using actual minja.hpp)...
All 12 tests PASSED

# try without the patch
> cd llama.cpp
> git checkout vendor/minja/
> cd ..
> .cosmocc/4.0.2/bin/make check
.cosmocc/4.0.2/bin/cosmoc++ -frtti -std=gnu++23 -isystem llama.cpp/vendor -std=c++17 -c -o o//tests/minja/minja_integration_test.o tests/minja/minja_integration_test.cpp
.cosmocc/4.0.2/bin/cosmoc++  -o o//tests/minja/minja_integration_test o//tests/minja/minja_integration_test.o
o//tests/minja/minja_integration_test
Running minja integration tests (using actual minja.hpp)...
make: *** [build/rules.mk:88: o//tests/minja/minja_integration_test.runs] SIGSEGV (core dumped)