Fix invocation in case of "ccache some-compiler-gcc". As the command "ccache some-compiler-gcc" will not exist but "ccache" will.

both visibility and relocs were affected.

Ported from OE by: Yu Ke <ke.yu@intel.com>

Index: qt-x11-opensource-src-4.5.2/config.tests/unix/bsymbolic_functions.test
===================================================================
--- qt-x11-opensource-src-4.5.2.orig/config.tests/unix/bsymbolic_functions.test 2009-08-01 08:01:11.000000000 +0200
+++ qt-x11-opensource-src-4.5.2/config.tests/unix/bsymbolic_functions.test      2009-08-01 08:01:16.000000000 +0200
@@ -8,7 +8,7 @@
 int main() { return 0; }
 EOF
 
-"$COMPILER" -o libtest.so -shared -Wl,-Bsymbolic-functions -fPIC bsymbolic_functions.c >/dev/null 2>&1 && BSYMBOLIC_FUNCTIONS_SUPPORT=yes
+$COMPILER -o libtest.so -shared -Wl,-Bsymbolic-functions -fPIC bsymbolic_functions.c >/dev/null 2>&1 && BSYMBOLIC_FUNCTIONS_SUPPORT=yes
 rm -f bsymbolic_functions.c libtest.so
 
 # done
Index: qt-x11-opensource-src-4.5.2/config.tests/unix/fvisibility.test
===================================================================
--- qt-x11-opensource-src-4.5.2.orig/config.tests/unix/fvisibility.test 2009-06-20 06:57:50.000000000 +0200
+++ qt-x11-opensource-src-4.5.2/config.tests/unix/fvisibility.test      2009-08-01 07:59:05.000000000 +0200
@@ -15,9 +15,9 @@
 EOF
 
     if [ "$VERBOSE" = "yes" ] ; then
-        "$COMPILER" -c -fvisibility=hidden fvisibility.c && FVISIBILITY_SUPPORT=yes
+        $COMPILER -c -fvisibility=hidden fvisibility.c && FVISIBILITY_SUPPORT=yes
     else
-        "$COMPILER" -c -fvisibility=hidden fvisibility.c >/dev/null 2>&1 && FVISIBILITY_SUPPORT=yes
+        $COMPILER -c -fvisibility=hidden fvisibility.c >/dev/null 2>&1 && FVISIBILITY_SUPPORT=yes
     fi
     rm -f fvisibility.c fvisibility.o
 }