[PATCH]: test: export SHELL from Makefile

Hello ccache devs,

I get the following test failure when 'SHELL' is not
defined in the environment when `make check` is run (e.g. it is defined
when calling 'configure' instead: `SHELL=/usr/bin configure
--prefix=...`):

test/test_util.c:99: Failed assertion:
  Suite:      util
  Test:       subst_env_in_string
  Expression: subst_env_in_string("$SHELL", &errmsg)
  Expected:   (null)
  Actual:     (null)

However, SHELL is exported by 'configure', so we can easily export its
value when running test/main.  The attached patch does just this.  I
hope you can consider applying it.

Happy Hacking,
`~Eric

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--- ccache-3.2.2/Makefile.in.orig	2015-05-10 07:24:44.000000000 -0500
+++ ccache-3.2.2/Makefile.in	2015-07-09 20:01:08.035640777 -0500
@@ -17,6 +17,7 @@
 LDFLAGS = @LDFLAGS@
 LIBS = @LIBS@
 RANLIB = @RANLIB@
+SHELL = @SHELL@
 
 all_cflags = $(CFLAGS)
 all_cppflags = @DEFS@ @extra_cppflags@ -DSYSCONFDIR=$(sysconfdir) -I. -I$(srcdir) $(CPPFLAGS)
@@ -80,7 +81,7 @@
 
 .PHONY: test
 test: ccache$(EXEEXT) test/main$(EXEEXT)
-	test/main$(EXEEXT)
+	SHELL='$(SHELL)' test/main$(EXEEXT)
 	CC='$(CC)' $(srcdir)/test.sh
 
 .PHONY: quicktest