Bug#1126726: libpnetcdf-dev: Build system paths leak into pnetcdf.pc

[Jonathan Brandmeyer]

Package: libpnetcdf-dev
Version: 1.14.0-2
Severity: normal
X-Debbugs-Cc: jonathan.brandmeyer at gmail.com

Dear Maintainer,

The pkg-config support file /usr/lib/x86_64-linux-gnu/pkgconfig/pnetcdf.pc leaks
some incorrect paths into the config.  In particular, it contains the following:

```
# prefix can be changed by "make install prefix=/path"
prefix=/build/reproducible-path/pnetcdf-1.14.0/debian/tmp//usr
# exec_prefix can be changed by "make install exec_prefix=/path"
exec_prefix=/build/reproducible-path/pnetcdf-1.14.0/debian/tmp//usr
```

Both prefix and exec_prefix should be set to /usr on the host's machine. As a
consequence of this leak,

```
$ pkg-config --cflags pnetcdf
-I/build/reproducible-path/pnetcdf-1.14.0/debian/tmp/usr/include
```

Programs which actively check the validity of this path, such as the Model for
Prediction Across Scales (MPAS) CMake-based build system produce an error.


-- System Information:
Debian Release: 13.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.63+deb13-amd64 (SMP w/16 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libpnetcdf-dev depends on:
ii  libpnetcdf6  1.14.0-2

libpnetcdf-dev recommends no packages.

libpnetcdf-dev suggests no packages.

-- no debconf information