Describe the bug
When using settings certain C compiler settings, test programs meson attempts to compile can fail due to missing newlines at EOF

To Reproduce
Example meson.build:

project('myproject', 'c')
executable('myexecutable', 'main.c')
cc = meson.get_compiler('c')
sizeof_int = cc.sizeof('int') 

Run meson with strict compiler settings:
CC=clang CFLAGS="--std=c99 --pedantic-errors" meson setup build --wipe

sizeof_int will be -1 in this case, because a compile of a test program failed due to missing newline.

Expected behavior
Meson test programs compile as expected.

system parameters
Fedora Linux 40
Python 3.12.6
meson 1.4.1
ninja 1.12.1