Bug 1418944 - Quote CC/CXX variables passed to nspr r=franziskus

The Makefile doesn't put quotes around the assignment of CC variables when
calling the nspr configure (if building with nss_build_all).

This breaks e.g. if someone tries to pass flags in the CC (hacky, but sometimes
makes things easier) or if there are spaces in the path to the compiler. In any
case, quoting makes things cleaner and shouldn't have any downsides.

--HG--
extra : transplant_source : %B6%DFj%0C/%1Ba%D8%B2%1F%3E%1A%87r%94%1C%7B%92%25H

Makefile

@@ -87,10 +87,10 @@ ifdef NS_USE_GCC
 NSPR_CONFIGURE_ENV = CC=gcc CXX=g++
 endif
 ifdef CC
-NSPR_CONFIGURE_ENV = CC=$(CC)
+NSPR_CONFIGURE_ENV = CC="$(CC)"
 endif
 ifdef CCC
-NSPR_CONFIGURE_ENV += CXX=$(CCC)
+NSPR_CONFIGURE_ENV += CXX="$(CCC)"
 endif
 # Remove -arch definitions. NSPR can't handle that.
 NSPR_CONFIGURE_ENV := $(filter-out -arch x86_64,$(NSPR_CONFIGURE_ENV))