Add nightly ARM & IBM platform builds

scripts/automator/build/gcc-linux_aarch64

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+# GCC flags for generically identified AArch64
+# Note: Advanced SIMD (aka NEON) is mandatory for AArch64 and implied
+cflags_release+=(-mcpu=native -mstrict-align)

scripts/automator/build/gcc-linux_armv6

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+# GCC flags for generically identified ARMv6 SBCs
+cflags_release+=(-marm -mfpu=vfpv2 -mfloat-abi=hard)

scripts/automator/build/gcc-linux_armv7l

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+# GCC flags for generically identified ARMv7 SBCs
+
+# Note: NEON SIMD instructions for floating-point operations are 
+# not generated by GCC’s auto-vectorization pass unless 
+# -funsafe-math-optimizations is also specified. This is because 
+# NEON hardware does not fully implement the IEEE 754 standard for 
+# some floating-point arithmetic operations, specifically 
+# "denormal" values are treated as zero, so in these corner-cases, 
+# the use of NEON instructions may lead to a loss of precision. 
+# For our purposes, we expect to perform normal calculations and 
+# thus accept this risk for release builds.
+
+cflags_release+=(-mcpu=generic-armv7-a -march=armv7-a -mfloat-abi=hard
+                 -funsafe-math-optimizations -mfpu=auto)

scripts/automator/build/gcc-linux_ppc64le

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+# GCC flags specific to the IBM POWER8 platform
+cflags_release+=(-mcpu=power8)

scripts/automator/build/gcc-linux_s390x

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+# GCC flags for the IBM S/390 and zSeries platform
+
+# Defaults include:
+#  -mlong-double-128, 128-bit long doubles
+#  -m64, generate 64-bit instructions
+#  -mfused-madd, use floating point multiply and accumulate instructions
+
+cflags_release+=(-march=native -mhard-float)