tree a19e5e9d67c8f2528f0d18aa7f42068eda2a3657
parent 495981805244269650bee13d1ee8f13543b2bc5a
author Patrick Williams <patrick@stwcx.xyz> 1619057349 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1619059109 -0500

build: fix pkgconfig yamldir var again

pkgconfig's should not have a fully formed prefix but
instead should use a '${prefix}' redirection.  This allows
alternative installed root paths, like you would find in the
OE-SDK.  Without this '${prefix}', the phosphor-dbus-interfaces.pc
in the SDK will have a literal '/usr/share/...' path and packages
using this variable will be unable to find the SDK-relative path.

Also, since the 'yamldir' variable is intended to be used at
cross-compile time (as opposed to execution time) it should similarly
be prefixed by '${pc_sysrootdir}' according to [1].

Tested: Copied the generated pkgconfig into an OE-SDK (to overwrite
the original one) and confirmed a successful meson build using this
variable and by manually running pkgconfig:

```
    $ .../sdk/sysroots/x86_64-oesdk-linux/usr/bin/pkg-config \
    --variable=yamldir phosphor-dbus-interfaces

    .../sdk/sysroots/arm1176jzs-openbmc-linux-gnueabi/usr/share/phosphor-dbus-yaml/yaml
```

1. https://autotools.io/pkgconfig/cross-compiling.html

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6b078fac65aac7c642358ad73a4acf9df1594174