Merge bitcoin/bitcoin#22783: build: Cleanup depends build system

539ca40 build: Remove unneeded share/man directory from libXau package (Hennadii Stepanov)
6c25c83 build: Remove unneeded share/man directory from freetype package (Hennadii Stepanov)
9067c6c build: Remove empty var/cache/fontconfig directory from fontconfig (Hennadii Stepanov)
4a37c26 build: Remove unneeded share/doc directory from expat package (Hennadii Stepanov)
acb9400 build: Drop non-existent share/pkgconfig directory (Hennadii Stepanov)

Pull request description:

  This PR:
  - removes non-existent `share/pkgconfig` path from `PKG_CONFIG_PATH`. This change, actually, make `PKG_CONFIG_PATH` unused in the depends build system
  - removes `doc`,  `man` and empty directories from the built packages

ACKs for top commit:
  fanquake:
    ACK 539ca40

Tree-SHA512: 41ffd5cea962f7533cb5d66ff9e8fd71a3dd7a8d9568b1bb63fc68e7070d7e416f6db02a0f8ab4d94063ee7f6370f00d62a5791b44f0d21c10666af590268c36

Author: fanquake

depends/packages/expat.mk

@@ -23,5 +23,5 @@ define $(package)_stage_cmds
 endef
 
 define $(package)_postprocess_cmds
-  rm lib/*.la
+  rm -rf share lib/*.la
 endef

depends/packages/fontconfig.mk

@@ -29,5 +29,5 @@ define $(package)_stage_cmds
 endef
 
 define $(package)_postprocess_cmds
-  rm lib/*.la
+  rm -rf var lib/*.la
 endef

depends/packages/freetype.mk

@@ -23,5 +23,5 @@ define $(package)_stage_cmds
 endef
 
 define $(package)_postprocess_cmds
-  rm lib/*.la
+  rm -rf share/man lib/*.la
 endef

depends/packages/libXau.mk

@@ -30,5 +30,5 @@ define $(package)_stage_cmds
 endef
 
 define $(package)_postprocess_cmds
-  rm lib/*.la
+  rm -rf share lib/*.la
 endef

depends/packages/qt.mk

@@ -248,7 +248,6 @@ endef
 define $(package)_config_cmds
   export PKG_CONFIG_SYSROOT_DIR=/ && \
   export PKG_CONFIG_LIBDIR=$(host_prefix)/lib/pkgconfig && \
-  export PKG_CONFIG_PATH=$(host_prefix)/share/pkgconfig && \
   cd qtbase && \
   ./configure -top-level $($(package)_config_opts)
 endef