package/ogre: fix build on musl

Fix the following build failure on musl raised since the addition of the
package in commit eb91fa73:

/tmp/instance-1/output-1/build/ogre-1.12.0/OgreMain/src/OgreStringConverter.cpp: In static member function 'static bool Ogre::StringConverter::parse(const String&, Ogre::int32&)':
/tmp/instance-1/output-1/build/ogre-1.12.0/OgreMain/src/OgreStringConverter.cpp:253:22: error: 'strtol_l' was not declared in this scope; did you mean 'strtold_l'?
  253 |         ret = (int32)strtol_l(val.c_str(), &end, 0, _numLocale);
      |                      ^~~~~~~~
      |                      strtold_l

Fixes:
 - http://autobuild.buildroot.org/results/491f89e45610a7752c0700ac02b80a92b7876ec3



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>