Make sure the build system honors C_INCLUDE_PATH and LIBRARY_PATH when
looking for headers and libraries.

--- Python-2.7.10/setup.py	2015-10-07 18:33:18.125153186 +0200
+++ Python-2.7.10/setup.py	2015-10-07 18:33:47.497347552 +0200
@@ -526,6 +526,14 @@ class PyBuildExt(build_ext):
             inc_dirs += ['/system/include', '/atheos/autolnk/include']
             inc_dirs += os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
 
+        # Always honor these variables.
+        if not cross_compiling:
+            lib_dirs += os.getenv('LIBRARY_PATH', '').split(os.pathsep)
+            inc_dirs += os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
+        else:
+            lib_dirs = os.getenv('CROSS_LIBRARY_PATH', '').split(os.pathsep)
+            inc_dirs = os.getenv('CROSS_CPATH', '').split(os.pathsep)
+
         # OSF/1 and Unixware have some stuff in /usr/ccs/lib (like -ldb)
         if host_platform in ['osf1', 'unixware7', 'openunix8']:
             lib_dirs += ['/usr/ccs/lib']
ble>
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<tr><td><span title='2020-10-24 13:18:29 -0700'>2020-10-24</span></td><td><a href='/guix/commit/gnu/packages/bootloaders.scm?id=e9545e6d1ddd0ecaa144c87f1196ff6e4439b59a'>gnu: u-boot-tools: Update tests.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2020-10-24 13:17:41 -0700'>2020-10-24</span></td><td><a href='/guix/commit/gnu/packages/bootloaders.scm?id=26c5e5af701b82b198c7dabf75e8c96937418e1a'>gnu: u-boot: Update to 2020.10.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2020-10-23 09:40:36 -0400'>2020-10-23</span></td><td><a href='/guix/commit/gnu/packages/bootloaders.scm?id=3b026eb3b1dd92c653d1a640b1280b96cfea3084'>Revert "gnu: u-boot: Update to 2020.10."</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-10-18 16:18:45 -0700'>2020-10-18</span></td><td><a href='/guix/commit/gnu/packages/bootloaders.scm?id=fe6067fc248673d6509b557ff010778f7762382f'>gnu: u-boot: Update to 2020.10.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2020-09-19 23:02:51 +0200'>2020-09-19</span></td><td><a href='/guix/commit/gnu/packages/bootloaders.scm?id=6b1253718d1d660e7a91bd59a96bdb16d7c5e0b3'>gnu: u-boot: Reomve sdl2 dependency on non-GUI builds.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>