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build: fix ARM vfp naming in configure script for older ARM processors

Rodrigo Muino Tomonari requested to merge github/fork/mnkhouri/vfp_for_older_arm into master

This commit changes the default vfp name from 'vfpv2' to 'vfp', affecting builds for ARM architectures older than ARMv7.

Valid options for 'arm_fpu' in gcc do NOT include 'vfpv2', causing gcc to quit with error: unrecognized argument in option ‘-mfpu=vfpv2’ when using the configure script with --dest-cpu=arm.

Gyp also expects only vfp, vfpv3-d16, vfpv3, neon.

GCC reference for the -mfpu= option: https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html Gyp makefile reference: https://github.com/nodejs/node/blob/v4.0.0/Makefile.build#L173

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