build, qt: Fix lib paths in *.pc files

See:
- QTBUG-72903, commit 9864d2c6f3b628ca9f07a56b197e77bd43931cca
- QTBUG-78873, commit e55a61a77f0c87c05661a0335dfdb12673c6a27f

Could be dropped for Qt 5.14+.

depends/packages/qt.mk

@@ -9,7 +9,7 @@ $(package)_qt_libs=corelib network widgets gui plugins testlib
 $(package)_patches=fix_qt_pkgconfig.patch mac-qmake.conf fix_no_printer.patch no-xlib.patch
 $(package)_patches+= fix_android_qmake_conf.patch fix_android_jni_static.patch dont_hardcode_pwd.patch
 $(package)_patches+= drop_lrelease_dependency.patch no_sdk_version_check.patch
-$(package)_patches+= fix_qpainter_non_determinism.patch
+$(package)_patches+= fix_qpainter_non_determinism.patch fix_lib_paths.patch
 
 $(package)_qttranslations_file_name=qttranslations-$($(package)_suffix)
 $(package)_qttranslations_sha256_hash=e1de58ed108b7e0a138815ea60fd46a2c4e1fc31396a707e5630e92de79c53de
@@ -226,6 +226,7 @@ define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/no-xlib.patch && \
   patch -p1 -i $($(package)_patch_dir)/fix_qpainter_non_determinism.patch &&\
   patch -p1 -i $($(package)_patch_dir)/no_sdk_version_check.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_lib_paths.patch && \
   sed -i.old "s|updateqm.commands = \$$$$\$$$$LRELEASE|updateqm.commands = $($(package)_extract_dir)/qttools/bin/lrelease|" qttranslations/translations/translations.pro && \
   mkdir -p qtbase/mkspecs/macx-clang-linux &&\
   cp -f qtbase/mkspecs/macx-clang/qplatformdefs.h qtbase/mkspecs/macx-clang-linux/ &&\