Make library/header paths visible to cmd/go script tests, which is necessary for
cgo/gccgo tests to work correctly

diff --git a/src/cmd/go/script_test.go b/src/cmd/go/script_test.go
index dfaa40548e..9d0f0e9bcd 100644
--- a/src/cmd/go/script_test.go
+++ b/src/cmd/go/script_test.go
@@ -100,6 +100,10 @@ const (
 var extraEnvKeys = []string{
 	"SYSTEMROOT",         // must be preserved on Windows to find DLLs; golang.org/issue/25210
 	"WINDIR",             // must be preserved on Windows to be able to run PowerShell command; golang.org/issue/30711
+	"CPATH",
+	"C_INCLUDE_PATH",
+	"CPLUS_INCLUDE_PATH",
+	"LIBRARY_PATH",
 	"LD_LIBRARY_PATH",    // must be preserved on Unix systems to find shared libraries
 	"CC",                 // don't lose user settings when invoking cgo
 	"GO_TESTING_GOTOOLS", // for gccgo testing
szko-scripts'>koszko-scripts</option>
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<div class='path'>path: <a href='/guix/log/?id=92c4b7c0fd74b4e71ad70bd94211e4dba35a012f'>root</a>/<a href='/guix/log/gnu?id=92c4b7c0fd74b4e71ad70bd94211e4dba35a012f'>gnu</a>/<a href='/guix/log/gnu/packages?id=92c4b7c0fd74b4e71ad70bd94211e4dba35a012f'>packages</a>/<a href='/guix/log/gnu/packages/enlightenment.scm?id=92c4b7c0fd74b4e71ad70bd94211e4dba35a012f'>enlightenment.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/enlightenment.scm?id=92c4b7c0fd74b4e71ad70bd94211e4dba35a012f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-03 10:11:19 +0300'>2020-05-03</span></td><td><a href='/guix/commit/gnu/packages/enlightenment.scm?id=1463079a2dc855df2274a2429dd48adc4d31ffdb'>gnu: edi: Update to 0.8.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/enlightenment.scm (edi): Update to 0.8.0.
[source]: Download from new uri.
[arguments]: Add custom phase to fix clang headers discovery.
[native-inputs]: Add check, gettext-minimal.
[license]: Add gpl3.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-05-03 09:34:46 +0300'>2020-05-03</span></td><td><a href='/guix/commit/gnu/packages/enlightenment.scm?id=13d3a9bf148cc653fd1be5fd45af75478d42f969'>gnu: evisum: Update to 0.4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/enlighenment.scm (evisum): Update to 0.4.0.
[build-system]: Switch to meson-build-system.
[arguments]: Remove make-flags, custom phases.
[inputs]: Remove alsa-lib, perl.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-05-03 09:34:46 +0300'>2020-05-03</span></td><td><a href='/guix/commit/gnu/packages/enlightenment.scm?id=67c8f879c5117732e58213d55a6b51ecc7f4bd54'>gnu: python-efl: Update to 1.24.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/enlightenment.scm (python-efl): Update to 1.24.0.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-05-03 09:34:46 +0300'>2020-05-03</span></td><td><a href='/guix/commit/gnu/packages/enlightenment.scm?id=5a743e1ef0f88bdd3ec358e1e90802328daf5e2b'>gnu: enlightenment: Change mount/umount binaries.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/enlightenment.scm (enlightenment)[arugments]: Use the
setuid binaries for mount/umount.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-05-03 09:34:46 +0300'>2020-05-03</span></td><td><a href='/guix/commit/gnu/packages/enlightenment.scm?id=b34793c14372fbda2246d68ef6270f1207e53e98'>gnu: efl: Update to 1.24.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/enlightenment.scm (efl): Update to 1.24.0.
[propagated-inputs]: Remove bullet. Add libpng. Move libtiff, libwebp ...
[inputs]: ... to here. Add openjpeg. Remove libxp.
[arguments]: In configure-flags disable scim, enable avahi, glib. Use
setuid mount/umount binaries.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-03-12 04:57:41 +0100'>2020-03-12</span></td><td><a href='/guix/commit/gnu/packages/enlightenment.scm?id=7247b841954f941df47d482a8c39f2c9851a6c2d'>gnu: ephoto: Update source and home page URIs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/enlightenment.scm (ephoto)[source]: Remove dead URI.
[home-page]: Follow (HTTPS) redirection.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>