Minor build infrastructure: introduce $(ALL_CPPFLAGS) and use it #1187
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This extra level of indirection, similar to that used in samtools's Makefile, simplifies making additions to the CPPFLAGS used during compilation (and simplifies ensuring that it's done without interfering with the user's setting for
$CPPFLAGS).e.g. this will let #1170 add
-DHTS_CPPFLAGS=\"$(CPPFLAGS)\"toALL_CPPFLAGSwithout needing anyTMP_CPPFLAGS := $(CPPFLAGS)trickery or questions about:=vs::=.Also fix related typo in the MSYS/MinGW part of configure.ac.